Starting a Three Box Group!

Tomorrow morning I'm off to Target to buy 2 more battlechests and then I'm gonna start triple boxing it up. I just have a few questions regarding class makeup. As much as I'd love to make 3 of the same classes because it would be quick and full of DPS, I kind of want at least 2 different ones due to the fact that once I hit 70, it would be weird to have my Priest (main) and then 3 mages, or something. Is there a decent class makeup that accomodates DPS and healing? I've been searching around and it only leads to more questions. Such as, how do I configure a Warrior/Mage/Paladin group? They all have such different abilities wouldn't it be confusing to make one button do a charge, and a frostbolt and a seal? And what about since that's 2 melee characters and one caster. How do I work the running?

Are these questions explained in a tutorial? I haven't read all of them yet, and will do so when I am starting to set up my three WoW's.

As of now, I'm thinking something like a Warrior / Warlock / Paladin. The Warrior or the Paladin could be subbed out for either Shaman or another Warlock. Or a Mage. Three casters would be easy, and the Shaman could off-heal / semi-tank. Shaman / Warlock / Mage. What does that sound like?

EDIT: While I have this thread up, what's multiboxing like on Macs? KeyClone is kinda gimp and so far I haven't really found an alternative, still searching though. I want the customization of the Windows version, but without having to switch back and forth between Boot Camp OS's.
EDIT2: Found Synergy, will try that!

Thanks, lol.
Eveso

boxing with more than one melee toon would take a bit of practice to do. I'd suggest one melee and two casters. From what you have, I'd suggest pally / mage / warlock. That could lead to some pretty nice AoE grinding later on. AoE tank with the pally, Arcane Explosion with the mage, and Seed of Corruption with the warlock.

Edit: I would suggest using the melee as the "main" or "head" character