Tier 1: Arcanist Regalia
Tier 2: Netherwind Regalia
Tier 3: Frostfire Regalia
Tier 4: Aldor Regalia
Tier 5: Tirisfal Regalia
Tier 6: Tempest Regalia
Tier 7: Frostfire Garb 2.0
Tier 8: Kirin Tor Garb
Tier 9 Alliance: Khadgar's Regalia
Tier 9 Horde: Sunstrider's Regalia
Tier 10: Bloodmage's Regalia
Tier 11: Firelord's Vestments
Tier 12: Firehawk Robes
Tier 13: Time Lord's Regalia
Tier 14: Regalia of the Burning Scroll
Tier 15: Regalia of the Chromatic Hydra
Tier 16: Chronomancer Regalia
Tier 17: Normal / Heroic (Preview)
Tier 17: Mythic (Preview)
Elemental Triad Armor (Challenge Mode)
13 and 16 rank pretty high on my list. I really like the actual cloth quilted look of those sets. The T17 and CM sets also really capture the different elements that mages use and display them in a very tasteful way (Khadgar uses some of these cues in the opening quests of Tannan).
T3 / T5 recolor
From 8-12 was good times to be a mage. 12 was my favorite, although if 8 had robes instead of pants I would have went that way.
I adore the CM set. I really liked the Kirin Tor set, very battle magey.
The bloodmage set (the normal and the heroic sanctified) was great as was the Firehawk set. I also like Tirisifal.
That is not dead which can eternal lie.
And with strange aeons even death may die.
That said, and the reason I quoted you, is that the T8 recolor set can be solo farmed and looks outstanding. This is my go-to xmog, pretty much 100% of the time.