my group runs:
Tanks- Paladin mt, DK OT
Healers- HPriest, Druid,Shaman(ele OS if we dont need the heals)
Mdps- Unholy DK, Frost DK(if OT isnt needed to tank)
Rdps- Boomkin, Fire mage, Spriest, Demo lock, Ele Shaman(if he isnt healing)
so far we have 9 HMs down in 10m, and we are still plugging away, not bad for a bunch of weekend raiders(we only raid sat/sun 4 hours each day)