You could run with a mixed group.

One set of five druids, who have amazing AoE healing.
One set of shaman, probably Elemental for DPS... and for Round-Robin of the Tremor Totem.

You could mix that up, and have one Boomkin for the caster buffs (Earth & Moon).
And one Resto Shaman for Earth Shield anytime 20+ DPS won't burn through a boss in seconds.

Then go with Mages, if that's your preferred class, to DPS with.
And whatever class you want to lead/tank with.
With that many toons, only several boxers in concert or Prepared would have even a chance against your swarm, at equal level... even if you were quite a bit back on gearing.