Dual Boxing Mage/Lock ....who to bring next

I am currently dual boxing a nicely geared mage/poorly geared lock and was wondering what you would recommend to bring over to run in groups of three...my currently available toons

Rogue

Resto Druid

Elemental Shaman

BM Hunter

Personally was thinking of bringing the Shaman , as far as similarity of casttimes, rez ability, and totem benefits.

Thanks

Nazzzcar

The shaman would be a nice addition as the Resto druid would probably be nice also