Hello. Here is what I recommend for the core computer parts. You'll need to add the KB/Mouse, Monitor, Case & DVD Drive. The reason why I left those out is because those parts tend to require personal assessment.
Both builds look nice - but to be honest, I'm aiming for the 5870 vs the nVidia. Also:
How much difference is there between a mobile and a desktop 5870? I mean, will there actually be a large FPS difference?
Also, on Newegg reading feedback for teh GSKILL Ripjaws suggests that AMD processors can't use the full bandwidth of the 1600 RAM?