Help me figure out a 3-box team for PvE.

Hello, I'm new to the forums and I currently dual box a few characters. None of em are 80 though. I've beendual boxing since mid summer, but TBH I'm prettty terribad. Anyway, moving on.

I am trying to put together a 3 - man for PvE content, I'm not much interested in Heroics, so not being able to do them is not an issue for me. Now I know I'll need a paladin tank, but the other two classes are eluding me and here is why:

Healer
Druid seems great here mostly for thorns aura, but then I'm not sure how much synch a druid has with the rest of the team. Shaman will synch well with the DPS and Paladin, but does not provide thorns or anything like it.
Utility/Damage
Mage is perfect, because a mage can aoe better, but if I go with shaman, a warlock who can provide afire shield seems much better. Moreover warlock can use his pet to offtank at times.

So please help me out to figure out what team I should run :(

just have a pally tank and make 2 ranged DPS. then when you need to instance grab a healer and another dps. Not controlling a healer will make life easier on you