Spectacular Death ran Herioc Blackwing Descent the other day :) We didn't get to Nefarian/Onyxia, but we did get something even better:
Barlafumble, Slayer of Stupid, Incompetent and Disappointing Minions, the longest title in WoW, I believe. And the most epic! Sadly, it's only temporary, lasting 30 minutes or until death.
I haven't been able to get the full Giantstalker set. I had to cheat a little with the chest piece, but it turned out okay.
Shoulders: Giantstalker's Epaulets
Chest: Marauder's Tunic
Shirt: Bold Yellow Shirt
Gloves: Banded Gauntlets
Waist: Cinch of the World Shaman
Legs: Giantstalker's Leggings
Boots: Giantstalker's Boots
Bow: Black Bow of the Betrayer