Nintendo Wii or Playstation 3?

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My method would be this:

Pick up the Wii

Wait until sixaxis is phased out for dualshock 3 and the PS3 picks up some games (probably this time next year it'll have a lot of great ones)

Sell 360 (hope it doesn't brick before then) and use the cash to buy a PS3

Then you have the Wii as your social machine and the PS3 as your personal machine. There's nothing the 360 can do that the PS3 can't. There's a truckload of things the Wii can do that the PS3 and 360 can't.  Keep an eye out for deals like 10 free blu-ray movies or or 2 free games with a PS3.