Thanks for the input guys! Keep it incoming, lets hear from the guy with the paladin healer, what does he think? I have a lot of paladins, and I could easily get 2 pally tanks and a pally healer as well.. although they don't bring near the same tools that a priest brings...
The only healer that I have ever used has been a priest. I don't think that any of the current 10 boxers are using pallys as healers. That being said you should give it a try if you want. You have tons of time until Cata comes out and since you have so many level 80s it might be worth giving it a shot. I know that if I had more than 10 level 80s I would be mixing and matching to try and find the comp that works best for me.

I think that your group comp looks good even without a mage lol.