I really liked the hunters rift stalker T5 set because it was the first set of raiding gear I ever completed, and always found uses for the 2-piece bonus for soloing on my hunter! :)
I Love the T2 Shaman set. I love the wolf shoulders, to me it just says shaman more than the other sets do.
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My favorite tier set is Plagueheart Raiment because I wanted it like no other back in the day. Also, my friends and I have been known to ride single file to hide our numbers.
Shaman T2 is still my all time favorite, nothing beats having two kickass wolves on your shoulders. Raw power!
My favorite would have to be the Tier 9 Set from WotLK Conqueror's Runetotem's Regalia. The set just looked epic on any druid and It was once of the few helm designs I actually liked.
Paladin Tier 2 Judgment set. They really encapsulated the artistic style of WoW perfectly with the colors and book/sword on the shoulders.
Hands down, and this has never been swayed, would have to be the Vestments of Faith. When I started playing I saw this human priest "Lieutenant Commander Sparklehorse", since then I've rolled my priest because of how amazing that armor looked. It's stuck with me through the 5 years I've been playing.
My favourite was the warlock T6 set because of the awesome wings :D
For me it's the Mage T3, the Frostfire set. I did not get it, but my god, that set was bad ass. You just want to shoot some ice. *pew pew pew*
Have to say Shaman T2, (Ten Storm), just love the "spiritual" look of that set. That set alone was one of the main reasons I made my Shaman back in vanilla :) (Still got the full set in my bank.. hehe)
Warrior T5 was ultimate set for the warrior was and always will be my fave :)
Bloodfang was the reason I rolled my rogue in the first place. I would never take it off if Blizzard introduced some kind of re-skin system.
My favorite set would have to be Warrior Tier 6, Onslaught Armor.During BC I was playing my Warrior still and lemme tell you something... nothing says "Tank" like a Warrior decked out in full Onslaught Armor with a Bulwark of Azzinoth. You are a literal wall of metal and spikes. When it's time to do some damage just swap to good old Arms spec (33-28-0 at the time), whip out your Cataclysm's Edge, and lay waste to anything and everything.