Mage T6, Tempest Regalia. It seems to fit the class better than the other sets... or at least Arcane.
Gronnstalker because it blinks and because hunters are awesome!
The priest Tier 3 Set was always my favorite. Something about looking like an angel is just so satisfying.
I would have to say my all time favorite is the warlock's tier 5 Corruptor Raiment. The Spiked skulls on the shoulders really looked awesome plus Nyhm used it in some pretty good machinima.
I've been a player since the beginning of Cata, and I can honestly say that the current tier set is my favorite. There may be a tad bit of bias towards that, as this is the only tier set I've experienced firsthand, but seeing that electricity flowing around my druids shoulders is incredibly awesome in every way.
I'm going to have to say the Paladin Tier 6, Lightbringer Raiment. In my opinion it's one of Blizzard's best sets and it's just fantastic looking. I remember using it way back in the good old days. Anyone I see with it is a Hero in my books!
I'd have to vote for the Paladin T2 Judgment Armor.
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I play a mage, but always loved Warlock T5 set. Black and reds with skull theme that fit the locks well. Didnt want to mess with a lock wearing that set.
Warrior T1. First epic gear set I ever wore. Will always remain epic in my mind.
Druid T6 has always been a personal favorite, it was one of the first sets I aimed for when I started raiding. It took a step away from the nature aspect and went with a 'we will find a way to impale you with our shoulders or peck you to death with our helm and/or horns" type of vibe. =D
best tier? tier 7, the first one when i join this game... so excited when worn the first piece :)
T7.5 Mage gear that was awesome!
Hunter Tier 8, Scourgestalker's Battlegear for the cliche badassery of armor with horns. Everything is better with horns.
Has to be Absolution Regalia T6 for priests on a night elf. just reeks of WIN WIN WIN