If I didn't care about money or heirlooms I would just level new toons on the other faction. It would essentially be like starting over on a new server. Leveling is so fast now it is ridiculous even without RAF. Even if you haven't leveled on the opposing faction they practically hold your hand now with all of the tools they have added into the game. If you have one of your toons do gathering just remember that they will get xp but the other members of the group won't get it. I got pretty out of sync from that level wise once but I had heirlooms to make up the difference.

You also have the option of just buying battlechestsx5 to get RAF again which can actually be cheaper than transferring toons but that will only let you play up til BC. You would still need to buy LK and Cata if you wanted to play to 85 which would obviously be more expensive.