Imo...thats a hard one cause if ur priest is healing ur shammy how are you going to hold aggro = / .I am doing a Warrior / Priest .I think you need a class that can hold aggro especially if the priest is healing .Or Do a Prot Pally / Warrior and have the Priest and shammy go as heals .Easier to set the macros eg Lesser heal and Healing Wave to heal the Main Toon . Thats just me thou .