I have multi-boxed before but not anything past 20 (trial accounts :\)

I am almost sure now that I am going to start a serious team as I have the money and soon the time to do so.

I really only want 4 accounts and I want shamans for my first team. I am not a fan of collection questions and questing in general. I have also attempted to solo instances with all shaman and all druids (shaman didn't work but druids did but with insane timing).

Here is my idea: I level 4 shaman and once I reach 15 I queue for random dungeons as a healer and 3 dps. Since I am queuing with a healer the pops are going to be just about instant.

So here is my Q: Should I bite the bullet and quest 1-60 with my RaF or should I just relax and run dungeons? (Has anyone proven one faster than the other?)