Well, it comes down to what you have more of, money or time. If you have 18 hours a day to play, I say jut level the toons you got. You are over a big hurdle already, so the rest of the way won't be too bad. Faster than leveling with RAF from 1-60 I bet.

If you have the money however, I would get 2 battlechests, and take 2 of your accounts, and refer one new account each. Then take the other 2 old accounts, and transfer the character to the new RAF ones. Then you are good to go, with only 2 battlechests and 2 $25 transfers. Not too much really. That also would give you a nice head start on leveling 4 more toons, in case you wanted an alt team.

Thats what I would do.