Well I'm a hunter, but that's actually kind of irrelevant. My favorite set by far is my tier .5 full Beastmaster set. It's actually not the most attractive set, but my god the questline to earn it all was the most epic thing I have ever engaged in in this game. I came late to the game, so I was way over-leveled for it, but I'm really, really glad I got it all before Cataclysm came along and made it impossible.
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I would have to say Scourgestalker (Hunter T8). Not only because it's the last of the Stalker line, but it looks completely amazing. Scourgestalker Battlegear
I actually like the T9 Arena set for Warlock most.If you take it out of context it's very aethestically pleasing.
Warrior T9 was the first tier i completed for both specs (fury and tank), so that is what is my favorite as of day 1 of the contest.
The Warlock's Malefic Raiment has got to be the best one yet. Love the demonic look it gives them.
I'll have to cheat a little, simply becasue i do not have one. (Wall of text inc. Short reason at bottom, but will require reading the wall eventually :P)Druid - Dungeon set 1.5 Feral Heart - Looks amazing for druids, the colour scheme works great for druids, under the glow of the Night Elven lands, and was also the first set in the game that for druids that included decent stats that were not directed at Healing.Druid Teir 4 - Malorne - Looks great for a Night elf because of how indepth it was/is linked to the very begginings of Druidism and how malorne would have wanted his armor to look, Golden white, with his stag horns on the helm.Druid Teir 5 - Nordrassil - Suiting the druids again with it looking almost like a branch of Nodrassil had been removed, and craved into battle garments from the single branch, with the growing flowers on the shoulders, and the wooden cresent moon on it's helm.Druid Teir 6 - Thunderheart - HALP I HAVE A BURD ON MAI HEAD! Joking. This is the gear i use for idling around Stormwind as i think it's one of the best designed in the game to date, No other druid armor has the amount of detail put into the complete set, looking like a Tribal / American Indian below the breast area linking/connecting the kilt, the shoulders look great, and wearing the helm with the bird motiff and the side burn type dangly things.Druid Teir 8 - Nightsong - For balance and Resto druids this seems one of the best designed as it links into the mythos of the moon which is the centre of Night Elven "religion"/"Belief", and also as it shares the same name as the single person in the games lore who was granted permission to command the Demi-Gods.Over all... Favourite is Teir 6 and DS 1.5, for the above reasons
I think the best set was Malefic Raiment. Those random wings made it cool and demonic as a warlock should be.
Rogue T2, aka Bloodfang, made me level a rogue. I hate leveling
Mage T2, awesome, bright, and glowy, and the Netherwind Prescence set bonus wasn't bad either.