cool48 on 20 October 2007
Go with the PS3, I'm not sure what version you're looking at but the 80GB is only 500$ with MotorStorm. All the good titles are comming out really soon, so I'd get a PS3.
http://www.us.playstation.com/PS3/About/ProductDetails/default.html?ILC-ffb&LCTN=LP_40GB