I like the Rouge Tire 11 Raide set caus it's look's sci-fi :)
Mage Tier 3 set was arguably the best and coolest set in the game, a shame I never got a hold of it. It was all about the frost and fire, who gives a crap about arcane anyways? MAGES FTW ;)
I know it's not out yet, but Warrior Tier 12 makes me want to raid Firelands just to get it. It's not hugely bulky like some previous warrior armor, but still has some amazing shoulders, a sick looking belt, and an intimidating helm like the old BC onslaught set.
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I'd say the shadowcraft set. Why? Well it was the first set i really had to farm for and lust for, when i finally got those boots or those shoulders it felt so good.. the feeling is undescribable. It also looks good and quite wow-retro.
Tier 2 for Paladins was and is my favorite set. The look of it is just of pure awesomeness.
I've always been partial to Crystalforge. Why do I like the goofy pink power ranger pride parade crystal armour? Simple, I play a draenei, the only race that doesn't look stupendously emasculated in that stuff."Oh, what's that, you're sad that you're covered in pink floaty bits? If you'll excuse me, I need to go be a neon pink beefcake somewhere else."
Warrior Tier 3 Dreadnaught's Battlegear, Looks very good :)
For me it ist the rogue T4 Netherblade it is the only one i nearly got complete and it looked awesome too :D .
If i was to choose one of the tiers from all classes, i would have to choose Warrior's T3.Apart from the stats And the set bonuses, which where EXTREME for that time, it is the nicest and more badass looking set ever! But that's not all.. Being a wow player since the early vanilla's, i know that to get this set, it was (almost) impossible! Naxxramas (old one) was probably the hardest raid ever available in the game, so only a few people actually got their hands on this set (and all other T3 ones) so it had a special value, unlike tiers after WOTLK.
Priest T6-- The Absolution Set. smokey faces!
Tier 2 paladin set, it's just too *templar* looking with touch of mystic. It's awesome. Nemesis set is maybe cool, but Judgement is best. Ever. The End.
Rogue T5. Just looked like a hardcore assassin, like someone you did not want mad at you :)
My favorite is Druid T7. I still remember how happy i was when i got every part of it. On my druid's bank i still keep full T7.10 and T7.25!