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Just pick a Prot. Paladin + Heal Bot (preferably Priest or Druid. In my case I am loving druid's instant heals and heals over time. I am AOE leveling/grinding and I never drink!) + DPS classes of your preference.
The Paladin is the only one not optional, IMO. At least before WOTLK, then Warrior will get a boost in AOE tanking.
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Theese classes bring synergy:
Elemental shaman (totems)
Moonkin (crit, +dmg, buffs)
Warlock (+dmg and health)
Mage (+dmg and/or crit)
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Definitely do something you think will be fun. I say get some more copies of wow and use the raf benefits to level up a few more teams with a good mix of classes so you can pick and choose! :)
Good to see that all the posts so far except one attempted to help and offered some information. /shrug