Playstation 4, but not until its $299 or less.
I'll only buy the Wii 2 if it gets hardcore games like Grand Theft Auto and Modern Warfare. I'd probably buy it at $200 or less (because I'll have already bought a PS4 and I have a limited budget)
I don't see why I'd buy the Next Xbox if I buy a PS4. I barely like any of the exclusives Microsoft has.