I'm now running 6 hunters 2 heals (priest/monk) 2 tanks (dk/dk or dk/pal depending on mood)
Can probably squeeze in an 11th to do a 3rd healer.

Right now I am just trying to get the 2nd grp of 5 geared just got them all to about 630ilvl (other guys are all 670-689). Controlling 10 is definitely interesting, to practice figuring out mechanics etc... I am farming BRF BOEs