Tiered Rogue Armor Sets
You’re not going to find this in a week. It requires a lot of work to complete and get all the items listed. There are 4 set combinations, Dungeon (acquired in 5 man instances), Raid (10+ man instances), Faction (Get Revered or Exalted) and PvP (Get a lot of Honor Points).
I would suggest you aim for a single set combo. Sure, it’s nice to mix and match but when you complete a set, you gain some nice bonuses.

Dungeon Tier
Notes: Nearly all of Tier 1 and 2 can be replaced at 60 from items in the Auction House. Tier 3a is statistically better than 3b and is miles easier to acquire.
Shadowcraft Armor set (8 pieces) Tier 1
●Tunic (General Drakkisath - BRS); 58 AC: 176, Agi: 26, Sta: 13
●Pants (Baron Rivendare - Strathholme) ; 56 AC: 150, Agi: 25, Str: 12, Sta: 12
●Shoulders (Cannon Master Willey - Strathholme); 55 AC: 127, Agi: 22, Sta: 9
●Head (Darkmaster Gandling - Scholomance); 57 AC: 141, Agi: 20, Str: 13, Sta: 18
●Gloves (Shadow Hunter Vosh'gajin - BRS); 54 AC: 105, Agi: 14, Str: 9, Sta: 9
●Boots (Rattlegore - Scholomance); 54 AC: 115, Agi: 21, Sta: 9
●Bracers (Smolderthorn Shadow Hunter - BRS ); 52 AC: 71 Agi: 15, Sta: 7
●Belt (Blackhand Assassin - BRS); 53 AC: 93 Agi: 14, Str: 9, Sta: 10,
Total stats: AC: 978 Agi: 157, Str: 43, Str: 87
●2 pieces: +200 AC
●4 pieces: +40AP
●6 pieces: Chance on hit to restore 35 energy
●8 pieces: +8 all resists
Darkmantle Armor set (8 pieces) Tier 2
This gear can only be had once you acquire the Tier 1 gear and then you need to quest for these pieces. All told, it costs about 400g to get the entire set. Quests listed here. http://www.wowwiki.com/Dungeon_Set_2
●Tunic : AC: 185, Agi: 31, Sta: 15, To Hit:2%
●Pants : AC: 160, Agi: 25, Str: 15, Sta: 15
●Shoulders : AC: 136, Agi: 24, Sta: 10
●Head : AC: 150, Agi: 26, Str: 18, Sta: 13, Crit: 1%
●Gloves : AC: 108, Agi: 22, Str:12, Sta: 9
●Boots : AC: 127, Int: 24, Sta: 10
●Bracers : AC: 79 Agi: 15, Str: 7, Sta: 7
●Belt : AC: 102 Agi: 17, Str: 10, Sta: 13
Total stats: AC: 1047 Agi: 184, Str: 57, Sta: 97, Crit: 1%, To Hit: 2%
●2 pieces: +8 all resists
●4 pieces: Chance on hit to restore 35 Energy
●6 pieces: +40AP

●8 pieces: +200 AC
Assassination (5 pieces) – Tier 3a
●Shoulder; AC:219, Agj: 25, Sta: 24, Atk: 42, 2 Yellow – Talon King Ikiss, Sethekk Halls
●Legs; AC: 256, Agi: 40, Sta: 33, Atk: 44, Hit: 22 – Murmur , Shadow Labyrinth
●Hands; AC: 183, Agi: 25, Sta: 24, Atk: 50, Hit: 17 – Aeonus, Black Morass
●Chest; AC: 292, Agi: 28, Sta: 21, Atk: 54, 2 Red, 1 Blue – Pathaleon the Calculator, Mechanar
●Head: AC: 237, Sta: 25, Atk: 66, Crit: 25, 1 Yellow, 1 Meta – Harbringer Skyriss, Arcatraz
Total Stats: AC: 1305, Agi: 118, Sta: 132, Atk: 256, Crit: 25, Hit: 39
●2 pieces: Cheap Shot and Kidney Shot gives 160 Haste for 6 sec
●4 pieces: Eviscerate and Envenom cost 10 less Energy
Wastewalker (5 pieces) – Tier 3b
●Shoulder; AC:219, Agj: 25, Sta: 13, Atk: 34, Hit: 16, 1 Red, 1 Blue - Warlord Kalithresh, Steamvault (H)
●Legs; AC: 256, Agi: 31, Sta: 27, Atk: 28, Hit: 19, Resilience: 4, 2 Red, 1 Blue – Aeonus, Black Morass (H)
●Hands; AC: 183, Agi: 32, Sta: 33, Atk: 16, Hit: 17, Dodge: 3, 1 Red, 1 Yellow – Kargath Bladefist, Hellfire Citadel
●Chest; AC: 292, Agi: 28, Sta: 36, Atk: 56, 3 Yellow – Keli’dan the Breaker, Blood Furnace(H)
●Head: AC: 237, Sta: 30, Atk: 56, Crit: 22, Hit: 18, 1 Blue, 1 Meta – Epic Hunter, Escape from Durnholde (H)
Total Stats: AC: 1305, Agi: 120, Sta: 139, Atk: 198, Crit: 25, Hit: 39
●2 pieces: Increase Hit Rating by 35
●4 pieces: Attacks have a chance to grant 160 Atk for 6 secs

Raid Tier
Notes: Tier 1 and 2 can be fairly easily replaced during the leveling from 60-70 and are located in 40 man zones. Tier 3 is still useful at 70, though certain parts will be replaced. Tier 4 is statistically better than Tier 5 and easier to acquire. Actually, not considering the gem slots, Dungeon Tier 3a is comparable to the Raid Tier. 1-3 were designed for the game at 60, 4 & 5 are designed for the game at 70.
Nightslayer Leather(8 pieces ) Molten Core Tier 1
●Belt; AC: 113, Agi: 17, Str: 9, Sta: 18, Fire: 7, Crit: 1%
●Gloves; AC: 125, Agi: 18, Str: 12, Sta: 17, Fire: 7, To Hit: 1%
●Bracelets; AC: 88, Agi: 20, Sta: 15
●Boots; AC: 138, Agi: 26, Sta: 18, Shadow: 7
●Shoulder Pads; AC: 150, Agi: 26, Str: 3, Sta: 12, Shadow: 7 To Hit: 1%
●Pants; AC: 175, Agi: 33, Str: 10, Sta: 15, Shadow: 10 Crit: 1%
●Cover; AC: 163, Agi: 20, Str: 6, Sta: 19, Fire: 10, Crit: 2%
●Chestpiece; AC: 200, Agi: 29, Str: 10, Sta: 10, Fire: 10, Crit: 1%
Total Stats: AC: 1152, Agi: 189, Str: 50, Sta: 134, Fire: 34, Shadow: 24, Crit: 5%, To Hit: 2%
●3 pieces: Reduces the cooldown of your Vanish ability by -30.0 sec.
●5 pieces: Increases your maximum Energy by 10.
●8 pieces: Heals the rogue for 500hp when they use Vanish

Bloodfang Leather(8 pieces ) Blackwing Lair/Onyxia Tier 2
●Belt; AC: 126, Agi: 20, Str: 13, Sta: 15, Shadow: 10, Crit: 1%
●Gloves; AC: 140, Agi: 20, Str: 19, Sta: 20, Fire: 10, Shadow: 10, To Hit: 1%
●Bracelets; AC: 98, Agi: 23, Sta: 13, To Hit: 1%
●Boots; AC: 154, Agi: 25, Str: 6, Sta: 17, Fire: 10, Dodge: 1%
●Shoulder Pads; AC: 169, Agi: 25, Str: 6, Sta: 17, Fire: 10, Dodge: 1%
●Pants; AC: 197, Agi: 37, Str: 11, Sta: 17, Fire: 10, Arcane: 10, Crit: 1%
●Cover; AC: 183, Agi: 27, Str: 19, Sta: 25, Frost: 10, Shadow: 10, Crit: 1%
●Chestpiece; AC: 225, Agi: 26, Str: 12, Sta: 17, Fire: 10, Nature: 10, Crit: 1%, To Hit: 2%
Total Stats: AC: 1292, Agi: 203, Str: 86, Sta: 141, Fire: 40, Frost: 10, Nature: 10, Arcane: 10, Shadow: 30, Crit: 4%, Dodge: 2%, To Hit: 3%
●3 pieces: Increases chance to apply poisons by 5%
●5 pieces: Improved threat reduction of Feint by 25%
●8 pieces: Chance on hit to strike for 283-317dmg and heal rogue for 50hp/s for 6s
Bonescythe Leather(8 pieces ) Naxxramas Tier 3
●Belt; AC: 142, Agi: 24, Str: 23, Sta: 20, Crit: 1%
●Gloves; AC: 158, Sta: 20, Crit: 1%, AP : 66, To Hit: 1
●Bracelets; AC: 111, Agi: 26, Sta: 14, Crit: 1%
●Boots; AC: 171, Sta: 18, Crit: 1%, AP : 64, To Hit: 1%
●Shoulder Pads; AC: 186, Agi: 22, Str: 22 Sta: 15,Crit: 1%, To Hit: 1%
●Pants; AC: 221, Agi: 32 Str: 31, Sta: 25, Crit: 1% , To Hit: 1%
●Cover; AC: 205, Agi: 30, Str: 18, Sta: 29, Crit: 2%, To Hit: 1%
●Chestpiece; AC: 262, Agi: 26, Sta: 13, Crit: 1%, AP: 80
Total Stats: AC: 1456, Agi: 134, Str: 94, Sta: 170, Crit: 10%, AP: 210, To Hit: 6%
●2 pieces: Chance on hit of healing you for 90-100hp
●4 pieces: Backstab, Sinister Strike and Hemorrhage criticals give 5 Energy
●6 pieces: Reduces threat form Backstab, Sinister Strike, Hemorrhage and Eviscerate
●8 pieces: Eviscerate has a chance per combo point to give a 100% crit chance on your next Backstab, Sinister Strike or Hemorrhage.

Netherblade (5 pieces) – Tier 4
●Shoulder; AC: 201, Sta: 24, Crit: 21, Atk: 44, 2 Red – High King Mulgaur, Gruul’s Lair
●Legs; AC: 234, Agi: 38, Sta: 34, Hit: 22, Atk: 76 – Gruul the Dragonkiller, Gruul’s Lair
●Hands; AC: 167, Sta: 30, Hit: 14, Crit: 21, Atk: 64 - Curator, Karazhan
●Chest; AC: 268, Agi: 28, Sta: 25, Atk: 86, 1 Red, 1 Yellow, 1 Blue – Magtherion, Magtherion’s Lair
●Head; AC: 271, Sta: 36, Hit: 18, Crit: 29, Atk: 74, 1 Red, 1 Meta – Prince Malchezaar, Karazhan
●
Totals Stats: AC: 1141, Agi: 66, Sta: 149, Hit: 54, Crit: 71, Atk: 344
●2 pieces: increases the duration of Slice and Dice by 3sec
●4 pieces: your finishing moves have a 15% chance of generating a combo point

Deathmantle (5 pieces) – Tier 5
●Shoulder; AC: 284, Agi: 29, Sta: 13, Atk: 40, Dodge: 20, 1 Red, 1 Blue
●Legs; AC: 332, Sta: 34, Hit: 15, Crit: 24, Atk: 110
●Hands; AC: 237, Agi: 30, Sta: 28, Hit: 20, Atk: 58
●Chest; AC: 379, Sta: 16, Hit: 10, Crit: 25, Atk: 100, 1 Yellow, 2 Blue
●Head; AC: 308, Agi: 30, Sta: 28, Atk: 72, 1 Red, 1 Meta
Total Stats: AC: 1540, Agi: 89, Sta: 119, Hit: 45, Crit: 49, Atk: 280, Dodge: 20
●2 pieces: Eviscerate and Envenom cause 40 more damage per combo point
●4 pieces: Your attacks have a chance of causing your next finishing move to cost no energy
Faction Tier
Notes: I am not going to list the individual items for pre-BC items, simply the totals. The reason is simple, you need to grind a lot of faction and it can take much much longer to acquire these sets than it would Dungeon or Raid sets. Since people no longer run these faction grinds, there’s no point for the large list.
Nozdormu – Deathdealer (5 pieces) – Temple of Ahn’Qiraj
Total Stats: AC: 982, Str: 94, Agi: 157, Sta: 112, Crit%: 3, Hit%: 4
Cenarion – Veiled Shadows (Ring, Back, Dagger) – Temple of Ahn’Qiraj
Total Stats: AC: 50, Str: 15, Agi: 45, Sta: 15, Hit%: 2, 65-121, 1.8spd
Zandalar – (5 pieces) – Zul’Gurub
Total Stats: AC: 419, Str: 27, Agi: 49, Sta: 54, Crit%: 2, Hit%: 1, Atk: 44

PvP Tier
Notes: There are really 2 sections here. Regular PvP, ie Battlegrounds and Arena PvP. The former you can participate at any time, the second you need to be in a group to do.
Battleground – Field Marshall (6 pieces)
Total Stats: AC: 1469, Agi: 144, Sta: 168, Crit: 42, Hit: 60
Arena – Gladiator’s Vestments ( 5 pieces)
Total Stats: AC: 1432, Agi: 137, Sta: 214, Crit: 55, Resi: 110, Atk: 110