I will let you know now, Atonement healing with priests doesn't work very well past lvl 85 in instances. You will run OOM too fast and unless you way outgear the dungeon, many bosses will outlast your DPS. Not sure about in PvP, but I think the same would be true. Plus, the atonement range is pretty short from where your target is. Won't be very good with Shaman I don't think. You wont heal much unless there is Melee on you, and if there is, you have big problems lol.

My priests are great, but they don't work for what I was hoping