My favorite is the priest tier 6 set because for me it always seemed to be the "priestiest" of all the priest sets. The shoulders of that set are my favorite item of all times.
I loved the Paladin tier 6. Wish I could've spent more time in it but I joined in late TBC.
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Rogue tier 2 was always my favorite, because the dark red and black color scheme gave it the most sinister look of all the rogue sets.
Tier 2 Mage - Love the colors and shoulder graphics
Mine would have to be the paladin t6, that armor has forced me to do so much! I rolled a pally as soon as I bought Burning Crusade. I had no idea what paladins were but I seen a few around orgrimmar, they had cool mounts, flashy looking spells and that awesome armor and I knew I wanted to play one. As I rolled one it taught me the basics or roles in groups and how I myself could perform them, I remember getting my bubble, and simply jumping off cliffs for ages. And now I'm level 85 and slowly working my own way towards getting my very own teir 6, along with all the other paladin pieces of gear and items I have collected, Lightbringer Battlegear the top prize for me! :D
Going by pure aesthetics, it would have to be Paladin T2, the Judgement set. No other set really captures the iconic spirit of the class as well as this one.
My favorite tier set is tier 4, the Voidheart Raiment. Even though I played for over a year in Vanilla, I never devoted time to raiding. This was my first actual set from a raid, so it became a bit special to me. I thought my character looked awesome when I first got the whole set.
I would have to say T11, Firelord's Vestments Firelord's Vestments,some of the old ones looked really good as well,but this one looks awesome,kinda makes you look a little bit like Ragnaros imo,how badass is that! I think its the ultimate firemage look,don't get me wrong,I love the oldschool sets like Tempest Regalia,Judgement Armor (A really awesome pally set),but this one takes 'em all in my opinion!
My favorite teir set is the Warlock T10 set, i love it because you look like a really evil skeleton, its one of the greatest imo.http://www.wowhead.com/itemset=-248#.
Shaman T10 was my favourite, because it looked awesome on a male troll!
Hm...I would have to say Mage T5. I love my mage, plus this was the first gear I truly tried to complete. Plus, I love the color red. ^^