My 10Box setup:
Unholy DK
Protec Pala
4 Elemental Shaman
Mage
Moonkin
Resto Shaman
Holy Priest

Substitutes:
Warlock for DK when OT wasn't needed
Eventually switching specs between Priest and Moonkin to SPriest and Resto Druid

I didn't try hard and was able to down 7 raid bosses with these guys. At the time, Pala+Elem Shaman had heroism badge gear+5m heroic gear. The others had mix of blues/heroic/heroism badge.