Symetry 3-box or 2-box

I'm trying to come up with a good team of triple or double characters to level. I have 3 accounts, 1 has a 70 frost mage on it. I was thinking about rolling 2 more mages for pvp fun... but I've seen all of these shaman videos and it's making me think about it!

Basically my main goal would be to get 3 chars to 70 and pvp with them exclusively. No 5-mans or anything. What 3 would be the best? Preferably 3 of the same char for that symmetry look!

I'm not a professional in class selection, but I what I am doing right now is 3boxing. 1 paladin, 2 mages. I think it might make a good 3v3 team. Paladin's are a bitch to take down, and 2 POM pyro's to the face is .. painful