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Tier 10 for rogues. Being a Vicious Geist looks awesome and the bonuses are just magnificent.
There's a lot of really nice tiers out there but my hands down favorite is Paladin T2. I didn't start playing a paladin until Burning Crusade but I wanted that set like burning, old content or no old content.
Aesthetically, the Rogue's Opportunist's Battlegear set is my favorite by far. It just LOOKS cool, and definitely like what I picture a rogue as: subtle & deadly.
My favorite was paladin t3, I like how it looked on my pally and I tried to get a full set but the instance was closed in WotLK :(
I really like tier 0, which I hope counts as an answer even though it's not a raid set. The dungeon set was just really awesome looking in my opinion, and the questline to upgrade it was fun and rewarding. While it doesn't have the spikes and high poly models some of the later sets do, it looks clean and pretty, which I think as a rogue fitting together nicely without too many spikes is a good feature.
It have to be the Warlock Tier 6 set. I walk around in Stormwind with that armor, quickly take off and on the helm so that the super awesome wings appear, and i get like 5 whispers about how they can get one.Priceless.
My favorite set would be the priest tier 1 prophecy set, it took 5 years and I'm still missing the gloves :( the looks are simple yet they mean a lot to me as that was a time where I've met the friends I have today. Thanks for their help on the benediction quest chain!
I'm one of those who's pining for the old Bloodfang set, and I'm still working on completing my set before Blizzard decides to randomly take it out of the game (damn you, Ragnaros - drop the pants already!). It's slick, it's gorgeous, the shoulders don't swallow female characters' heads, and the colors are bright and indicative of a rogue. Tier sets nowadays are all "throw everything on them, including the kitchen sink" and drab colors. We need a revival of the T2 style.
"Judgement," the Tier 2 Paladin armor set. Without question. As a Warrior, I was extremely jealous (not just because Warrior T2 looked like an over-zealous can opener...), as were many people, just from how imposing and epic the design was, on top of the incredible colors used in the design. Truly an epic feeling set, one I've yet seen beat in terms of overall look and feel.
The Hunter's PVP S3 Vengeful Gladiator's Pursuit (Arena Season 3 Set) http://www.wowhead.com/itemset=723Bottom line is, That helm which made you look like Mad-Eye-Moody was THE coolest helm in the game. Walking around with a 3rd eye, well I have to say - even the Dancing Night-Elf Female toons on the mailboxes had to do a double-take ;) Screens: http://www.wowhead.com/item=33666#screenshotsWhen in doubt, Poke it with a sick!Stroke