So I'm completely new to multi boxing, but really want to try it out. I'll be starting characters fresh from level 1.

I'm looking for a comp that can do these things: 5v5 Arena, random BGs, and say Tol Barad/other dailies. I'm on a PvP server if that makes a difference.

My first instinct was Shadow Priest x5. They are pretty powerful individually, and I feel that they have good group synergy. I could "round robbin" (I think that's what it's called) silence and fear for CC, spread dots and burst. A mind blast/Death combo with dots ticking from 5 at the same time would be pretty powerful. Alongside that, they have decent defense with shields and dispersion.

I then looked at warlocks, as 5 rows of affliction dots is a LOT of damage. but they don't seem to survive all that well.

I looked at the classic elemental shaman set up, but I'm not really interested and they seem pretty squishy.

I also looked at an all melee set up; DKs or maybe prot paladins. But I'm unsure how melee will work out in a multi-boxing set up.

Basically; I just need a bit of direction on what is most effective. I don't plan on doing instances, at least not for a while.