Tier 3, because I have a full (9/9) set in my bank and no one can get it if they don't have it.
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My favorite would have to be the Level 80 "Gladiator's Felshroud" set, simply because it was the first "set" I actually had a fighting chance to get!
The old school t5 warlock set is an amazing set! Malefic Raiment by far my favorite. I cant say how many times I have stopped and stared at those demon wings when they pop out. All most as jaw dropping as the pheonix mount.
I loved the Tier 8 Set for Paladins, but only the 10-man version. I just loved it, becuase it fitted Paladins so well.
I love tier 5, it looked so cool.
I really like the Death Knight tier 11 with the red/orange look. The head piece looks a crown which makes you feel like a king/knight and the fiery looks maks you think he just walked out of hell.Would love too see more those the color schemes.
My favorite tier set. Probably the druid tier 8. The four piece bonus was sweet at least in theory. Also it had a proper ancient druid look.
Paladins Tier 2 set Judgement Armor is my favorite. Paladin in it just looks so epic and righteous and with Quel'serar in hand is pure ownage ! ;)
I love Hunter T11 because it makes me look like a Murloc. And it's awesome stats.
Warrior tier 11, http://www.wowhead.com/itemset=943. I have been playing warrior since vanilla and I have been feeling lucky to have most of warrior's tiers look awesome. But tier 11 looks particular nice not only because it has the updated texture, well design with theme, but also it looks like terminator!