I was going to suggest a frost mage for replenishment, but then read you switched it

My planned 10box group will be:

1 paladin
1 mage
1 priest
2 boomkins
5 shamans

I couldn't decide on a tree for heals, or the priest.....I used to be a kickass priest in my soloboxing days, so I'm already used to healing as one. Never healed with a tree before.