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Astrogha -- at 125, first time I tried the new Astrogha fight. Spirit of Vengeance is so good, kind of invalidates some fights
Uldyssian -- at 130
The Void -- at 130
Atanna Khan / The Sleep
Did this one at 131. It's really hard for this character, but probably a fair price to pay considering how easy some of the other fights are for Caster Storm Amazon
Ascendant Riftwalker (Invasion III Bonus Quest)
I'm 142 and at this point overgeared, this fight was much harder when I did it at-level due to the immunity aoe phase always being a death if I didn't port to the boss immediately (which also ruined a lot of bonus attempts).
First time I've done this fight. Pretty neat, although it took me a while to figure out that you can avoid death from the Wind by standing in the fire in the center, haha.