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I would have to say T9. It was the first tier I actually owned and it had a great set bonus.
Druid t5 set, it symbolizes the druids and their nature perfectly like no other set Nordrassil Harness!
Oh god... i love really love the hunter dungeon set http://www.wowhead.com/itemset=186#. BEASTSTALKER... was too good, i like how it looks, and how i felt when for the very first time i saw it. Like a night elf, i though that i belonged to Maiev's hunter class circle T_T soo good.
I really liked the heroic mage T10 ICC set.You got to dress up in better WOW vampire gear than the San'layn Blood Princes themselves were given!
My personal opinion is that the Vengeful gladiator's Felshroud (Warlock set ; Vengeful Gladiator's Felshroud ) is the best looking set in WoW. The warlock had a really epic - looking appearance with it. He was like a real sorcerer from the Nethers, beating wings with dark magic along with skull-like helm. Great style and creativity.
For me it just has to be the Paladin T2 Judgement Set. (Judgment Armor) It's practically perfect in every way and it is also how I imagined a Paladin fully armoured would look like while reading the books.Plus Iit happens to be the only armour set in the game that me and my other half agree on that it looks awesome.
I've appreciated many tier sets over the years, but since I main a priest, I'd have to say that Priest Tier 8 (Conqueror's Sanctification Regalia) is my favorite so far. I love the guardian angel motif as much as anyone, but Sanctification was the first raid gear to make a priest look somewhat sinister. When I was sporting T8, I wasn't just a holy priest. I was an Inquisitor!
My favorite tier set is the paladin T8 Conqueror's Aegis PlateThere was just something special about it.
Tier 2 was my favorite because I enjoyed the quests to earn it. Unlike just rolling for it now.
T10..because I had them..lol t 11 is nice, but not sure if I will ever get them
I always enjoyed the enhancement shaman T5 set. I think that it looked cool and since I never got all the pieces I think of it as the one that got away.