Optimal WOTLK 5 boxed group?

With the RAF thing, I've lately been 5 boxing up a group that I hoped to use for 5 mod badge farming at a later date in WOTLK. My main that I'll be doing 10 and 25 man raids is a Holy Paladin, so I planned to use him for the healer since he'll be very well geared. I then decided on a Prot Paladin tank, shaman for totems, and a pair of warlocks for dps. They're currently at 50, and I was planning on doing a lot of leveling on them over the weekend.
But I still have other options before I finish leveling them, and was wondering what those who have been following the expansion news thought in terms of group composition. I have a 63 druid I could also level up, for a Feral tank instead of the Prot pally, and an already 70 mage and hunter, though I don't see those really being as useful. There's a 42 priest and 30 warrior I could gift levels to and bring them up to speed, or even gift 30 levels on a new guy, then transfer him over to the other vet account and gift another 25, bringing an entirely new character up to speed.
So, opinions from those more experienced than I?

who knows what wotlk is going to be like, particularly with the addition of the DK.
My guess is that most 'holy trinity' groups will work, as blizz probably doesnt want to make a specific class 'necessary' to run things. But who knows which will be the best class makeup? i think we'll need to wait for a couple months past wotlk to know that

I think prot pally, lock, mage, shammy, priest is going to be the best bet. I'm confused when people say 3 different dps classes are harder. They can all use a spammable dps macro making them just as easy to use as 3 of the same class (almost).

My thought is that you'll have too many different classes and get confused with a spread like that. I'm only 50 on my 5 man squad, but I've read often that simplicity is often a good thing. And aside from warlocks having seduce, shamen also get a 30 second hex (45 second cooldown). So I'm thinking that 2 locks and a shaman might have enough CC without having to add a 5th class to the mix. Priest may well be the best healer choice, I just know the holy paladin will be the best for me since he'll have raid gear already.
Speaking of which, those multi-shaman teams may do well with Hex rotations.