heres the setup me and the gf are building atm. just lvling the extras atm.

DK tank
Pali Tank - off spec holy for when only 1 tank needed
2xdisc priest - glyphed holy nova rocks for healing multibox teams as we're always next to each other
2x ele sham - totmes especialy cleansing to make your life much easier
warlock - SS, extra stam, loads of nice bits
boomkin - spell haste buffs etc
hunter - 3% raid dmg and takes all the wasted melle dps gear
mage or hunter - will have both as we had a spot in the lvling group so making an extra hunter. mage can make food b4 the raid anyway heh.

think its a pretty solid 10 man tbh, i cant think of anything Id want to drop.