My second Group is Mag/shm/brd/nec/nec/nec.
I have all real pets on taunt for aggro pingpong, brd does pulling, cc if needed, dps-booster for caster and their pets plus his own dots, shaman throws mainly all kind of groupheal at hand.
Any content, apart from those nasty names with antipet-mechanic, is easy to take down with that team.
Mage set as mt, leading char is brd.
If you want a real tank, swap mage for him. In that case, I would prefer SK, as I know him best out of the tanks. I would lead the group with the sk, as he's one of the best pullers as well for my feelings.
I would grow a mage on one of the accounts, to have always petgear available.