The T9 set for heals priest Velen's Raiment is the set for me. The female priests look awesome in this one (the head piece is not at the same quality as the rest of the set, but you have the option not to shown the head piece :P).
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The mage Tier 3 set was my favorite set so far. Loved the look of it and just looked mage like :D. Helped me actually pick the mage as the class I wanted to play and don't regret it :).
Darn, it is so hard to choose. There are so many badass sets that just look amazing. To narrow it down i liked the tier 10 sets the most. I liked every single class set of tier 10. But with the nick of a hair i would say my favorite is Death knight tier 10, the Scourgelord's Battlegear. I fell in love with the helm on it so much i leveled my death knight to 80 just to where it. I didn't even like the class all that much too. I spent days gearing up after level cap and ran heroics and raids to get in ICC as fast as possible. I eventually saved up enough frost emblems to get the helm and the shoulders. I was the epitome of a badass.
My favorite is the heroic Lightsworn paladin (ret, with Shadowmourne) set from Icecrown Citadel. It was the right dark/fantasy kind of look without being as cartoony as some paladin sets can be. The Zul'aman agility mail sets are a close second. The bird skull helmet was awesome, and the new orange version of the set is great.
Tier 6 by far. Awesome gear for shammy's. Loved it!
My current favorite is the Hunter T11 (And most hunter tiers) because they look like they're crafted from enemies corpses rather than just amazingly well crafted items the bosses seem to be holding for no apparent reason.
My favorite tier armor is Paladin Tier 6 =)! It truly shows the awesome Holy Power that represents Paladins - So much so that Blizzard chose it to use on Tirion Fording, the greatest Paladin currently residing in Azeroth! Not only that, I believe this armor doesn't deviate from the lore nor "fashion style" of Azeroth. It isn't to outlandish, yet not to subtle. At the same time though, it manages to stand out and let people know what class you are and that you've chosen to stand for the light! For the light!
Paladin T6, it was beasty...enuf said.
season 2 rouge pvp gear the Merciless Gladiator's set has to be my favorite only be cuz the head looks bad ass
I'd have to say that Pally T2 is still my favorite. The armor gives off this vibe of justice and the Light, with the designs on the shoulders and chest. And I loved the turtleneck-type collar it had. It just looked so great with or without its badass mask.
I like tier 10 the best, mostly because of Paladins Lightsworn sets, and Death Knights Scourgelord stuff.
I guess I'm one of the few mages that LOVES Mage Tier 8, Conqueror's Kirin Tor Garb. I just love its look and of course the fact that it features pants and not a skirt. I'm fine with the "skirt" usually, but every single other mage Tier armor looks that way. The Kirin'Tor Regalia is just pleasantly different for once.
I really like DK Tier 11 and even more on Heroic!
The Shaman t10 set is by far my favorite. The gear with random animations always catch my eyes; I would love to see more of it. (And some more bank slots to keep all the out dated awesome'ness in!)