Based off of all their statements regarding class changes in Cata I *really* think you should wait about a month before you start looking at what exact setup you'd like. Yes, right now Priests make great 10 box healers and Paladins make great tanks... But everything they've announced indicates that *every* healing class is going to function for the most part similarly. Same with tanks. They don't want tanks that just spam 6/9/6/9 and they don't want healers just tab-hotting.

That having been said, I agree that a ranged team is going to be about 5x easier to handle than a caster team