In my prior experience I ran a 4 hunter / 1 Priest combo and this is what I did:

1) 3 BM (left over in Marksman) hunters and 1 Trueshot Aura (Marksman/ left over in BM) hunter
2) I felt the priest did more for group healing and if I'm not mistaken (it's been a while) the group heals covered the pets as well. The reflect bubble/fort buffs help the pets be better tanks etc.
3) I ran 1 tank pet, 1 wolf (this was the Marksman's pet) for the additional AP buff, one other ferocity pet and a cunning (depending on pet specials)

The trueshot aura and the wolf howl do wonders for the groups AP.

Just my experience.