Having an elemental shaman in there will also save you from De'ing all unusable gear. The elemenatal shaman can pickup the leather and mail pieces so not everyone is fighting for the same gear.

I also love disc healing. So then what I would do is make a disc priest healer, drop a healing totem instead of mana since you can give everyone wisdom and have a little AOE healing that way. I would go with pally, ele shaman, 2 frost mages and disc healer