NVIDIA GeForce Go 8800M GTS Vs. ATI Mobility Radeon HD 2600 XT?

I want to know pros, cons. The laptop that comes with the Nvidia costs 1.5k Comes with 4gb ram 320 hardrive 1.8ghz cpu and the laptop with the ATI costs 1.1k comes with 3 gb ram 320 hd and 1.83 ghz cpu. (Please dnt leave answers like "free laptop stuff")