well the fastest way would be to make a temp RAF account, and quest with 2 of em, and occasionally boost with 3 70s for instances. You're looking at roughly $25-35for a battlechest, if you want a zhevra thats another $30, and if you want to xfer the other toon off of the RAF account, thats $25 more.

But if you are just gonna keep it regular, I'd just pick up all quests, and have the 70s kill the mobs for you and just turn the quests in.