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Priests Tier 5 is so cool. They are mystic and nice. Thats why I love them.
My favorite when it comes to looks is the Priest Avatar set (T5). I also like the T6 set, except the shoulders, they don't really fit IMO.As for stats, I have to say the upcoming T12 sets have really interesting bonuses, the most exciting ones I've seen since vanilla.That also means I really liked the vanilla sets as well, since they had interesting bonuses and had 8 pieces, it made it feel more..."complete". The old PvP sets were also really epic in terms of looks.
Tier 8 or Tier 10 for shaman.Both had a definite shaman feel to them. T10 had a 'I deal with the spirits' feel for the shaman class. T8 had a 'My attunement with the elements gives me massive floating boulder shoulders' feel to them.If I could reskin the current armor tier, I'd alternate between the two.Not my favorite, but I also liked tier 9 shaman gear. It actually looked like mail armor without all the crazy that happens to gear sometimes.
T10 Warlock was my favorite to date. Reminded me of black mage from Final Fantasy, and really cause it looked wicked on my undead.
Hunter Tier 8 was pretty awesome. The gas mask from hell will always be one of my favorites and the shoulders were bladed and not overly huge. Even the skulls on the pieces didn't seem out of place and the color scheme really captured Ulduar. I hated switching to the generic and uninspired genie look of Tier 9 from something this sexy. Tier 8 was the only time I can remember having my helm displayed from any of the tiers of gear.
Hunter Tier 2 would be my favorite imho. The whole Dragonstalker set was awesome, the only thing i didn't agree on was the choice of colors used. Hopefuly it gets a remake like Cryptstalker did in Wrath but with a better choice of colors then purple and gold, something more fitting to Cata seeing as this X-pac is based on killing dragons.
I would have to say my favorite would be the druid tier 8, Nightsong (from Ulduar). Looked like it was made out of wood, and was just very druid-y.
https://www.wowhead.com/classic/itemset=734#.Warlock Arena S3 set - looks especially daunting on a gnome ;)
Mage Tier 11 Firelord's Vestments , because come on. Who doesn't want to look like a little ball of Doom. Everytime I see a mage with that Helmet...I run the opposite way.
Absolution, Priest t6, hands down. No tacky wings, no overblown shoulders, no toilets of any sort. Just simple elegance that looks even better in shadowform.
Bloodfang