I currently am running the pally/shamanx3/priest team and there great. I have also ran pally/shaman/druid/mage/priest team which actually will be leveled once the others are at 80 currently 74-76, now if you want to keep the druid as a healer then you have to tank with the pally so you can either throw in a shaman or a boomkin or since you are filling in for a 5 man then you can just do both of them, now I don't recall which or the buffs dont stack just that if it is similar the one with higher stats is what you will get. Now a priest is nice to have as well for his buffs I like my priest quite a bit other than he's all screwed up right now, but he has no issue keeping me up if he stays alive. Again since you want to keep your druid resto then no need to get a priest since it would be a waste probably go with first option of druid and shaman for your other 2.

Thoughts of others?