I'm a long time player of pencil and paper AD&D, and monks are by far my favorite class to play.
If they won't give us a monk as a class in WoW (which I think would have solved the paladin/shaman balance issue instead giving the opposing faction) Think about this for priest talent trees...
A merging between Holy/Dis Keeping Shadow in the same concept and giving the 3rd spec a Monk feel. Melee with high avoidance/crit. Hand to hand, maybe fist weapons and staves. Your spells would make your bare hands use light or dark power with your punches and whatnot. Keep SP as the attack because even tho you're melee fighting you're charging your fists with a spell. kind of like Shaman weapon buffs but on a hit by hit basis.