What toon should I level to 80 next? <WORLD OF WARCRAFT>?

Ok I have an 80 shammy who is elemental/enhancement, and my other 80 is a protection paladin. I have a 73 lock, 72 hunter, 73 priest (disc), and a 73 druid (feral tank). I dont know what to take to 80 next. and i am willing to change spec's and whatever. i also have a 51 mage and rogue. lol. i have been playing for a while. lawl. so yea no flaming cause i have no life. i do have a life.