Ahune Update: A group of guildies went in again last night to try and get this boss down. This time we took 2 druid healers, a warlock, pally tank and shadow priest. The shadow priest was in blues/greens, but the rest of us were in T4+ gear. This was a long fight, and I had to innervate myself once and pot a few times, but we did finally get him down with no wipes! The only change we made in strat from the first try was beefier tank (18k hp vs 15k) and two healers instead of one. When the boss was vulnerable we all went on DPS, healers too. I'm sure our DPS went down from the original group and it took us four waves to get him, but we did it. BTW, the epic staff dropped and we gave it to the shadow priest :) That thing is very cool looking!
I guess the moral of the story is, if you can't beat this guy cuz the adds keep wiping you out, try adding an extra healer instead of more dps.