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Warrior tier 6, Onslaught. It was awesome having a tank that looks like a friggin' tank
Definitely Absolution Regalia, the Absolution set. It's been a while since priests have looked decent in their tier sets.
My favorite tier set? It has to be the Justicar Battlegear (Justicar Battlegear) because my main character is a Draenei and ever since I have watched the introduction movie for The Burning Crusade I have always wanted to get my hands on that set of armor, including the Hammer of the Naaru that is shown which seems to fit in just fine with it, it is simply not because it "looks cool", it is because I feel that it represents in it's entirety what the Draenei's nature is: To Vanquish a Cosmical Enemy, you can think of it as some sort of "Space Paladin Armor"...I have actually gone ahead and got all the set pieces just for the purpose of being able to do some old-fashioned Outland Grinding, just because I am a completionist at heart, while looking heroic and proud at the same time, this seems to actually be the armor which the Draenei Paladin have been made for and I refuse to wear anything else unless I am forced to do an heroic dungeon or a raid, because I just don't want to let go of it's amazing "outlandish" design.((Lastly, I would like to thank WoWHead and Maingear for this kind opportunity for actually enabling International Users from entering one of these exciting contests))
Paladin Tier 6 is by far my favorite of all time!
My personal favorite set has always been Might for warriors. It looked so unique compared to the other Vanilla sets, and it was from an era when armor was nearly ubiquitous. You could use that armor you loved for multiple purposes, making the challenge of getting it that much more rewarding loved how specialized you had to be. Granted it's an outdated gear system, but there was an appeal to being able to grab a single set of armor and simply walk into a battleground, raid, or Mordor.
I believe the best looking tier set was the T1 paladin set. :)
Warrior T3 was definitely my favorite. I never played a warrior myself, but when i dinged my first character to 60, naxx was still just getting cleared, and I remember watching the tanks of the big guild gear up over time and thinking "HOLY CRAP that looks epic"
My favorite tier is the tier 6 sets. Mage tier 6 looked awesome. Also, the tier 6 sets being 8 pieces made them more epic.
The redesigned Paladin T2 armor. To this date, my favorite looking armor set in the game. They did the revamp so much justice.
I remember the Avenger's Battlegear from Ahn'Qiraj, it was probably one of my favorite paladin sets as far as set bonuses went, it certainly wasn't the most attractive tier set I'd ever laid eyes on. If you asked me what my favorite looking tier set was, I would say hands down the paladin tier 1 set "The Lawbringer" aka the Banana set. I always felt it was one of the more regal looking sets for a paladin. I've been looking at the new T12 paladin set, and it looks vaguely reminiscent of the tier 2 set the "Judgement Armor" albeit a Super Saiyan kind of suped up version, maybe its the helm, or the giant flaming shoulder pads. It must be pretty damn hot in that set.
The Druid's Cenarion Raiment was definitely my favorite! It is the one, in my opinion, that gave the most 'one with nature' feel that druids should have.
Warrior T4 still looks fantastic. I just really like the aesthetic. The BC sets in general I thought were very good.