Half joking answer: bard & 5 beastlords.
My current unstoppable group is SK, Cleric, Druid, Mage, Enchanter, Beastlord. Cleric & Druid are heavy on dps with patch healing together on MT. Enchanter does debuffs and holds mana for crowd control, beastlord uses pet discipline and pulls. In the lower levels the enchanter or cleric pulled. The dps is painfully slow, but steady. Many bad pulls that should have been an EVAC or a wipe were controlled and taken down.
My last group was Paladin, Shaman, Berzerker, Monk, Ranger, Bard. Tons of DPS and was fun, but without the Pally patch healing, the shaman could fall short at times. Still really fun to stomp mudholes in mobs faces with.