I've gone down to dual-boxing. Decided to see if my DK could handle him toe to toe, and managed to solo him. No mount, but I did get a good trinket which put me over 40K unbuffed HP. This is my DK http://www.wowarmory.com/character-s...dscalp&n=Khaas

The rest of my guys have been moved to a single account. So I have 10 level 80s on one account, and my DK on another. A guildie has come along to give me a hand, a DPS warrior that makes the whole thing go even smoother. So, I log in an alt summon, kill. Rinse repeat. I'll post back when I have some more stats on the drops later today. Just wanted to chime in, he IS possible to solo.