A TRON Legacy Vault Edition (c'mon Stern, everyone wants it) would probably be the only new game I'd entertain.
In the more realistic side of things:
I wouldn't mind a Getaway I could score one for a decent price.
I've always kinda wanted a Jokerz for some reason.
PinBot would be cool (now that I don't have a JackBot anymore)
Swords of Fury would be really awesome.