I have been playing a prot pally and 1 rest 3 ele shamans. I find this group very easy to 2 step 1 button mash. With quite a bit of utility and i see that many on here use this group to do heroics. However! i have been pondering doing a mixed group so that A) i can make use of more drops B) Have some variety in skills and talents. But before i embark on this i wanted to ask if the following groups are viable to do cata heroics etc.

The group i am considering is..
Prot Pally
Arcane Mage
Ele Shaman
Boomkin
Holy Priest

For healing a resto shaman i suppose may be a bit better riptide + earth shield and then do some dps.

But any suggestions or experience in how viable this group would be long term to do heroics etc would be great!

Thanks