I want to play GTA4 on my PS3 because the vast majority of my friends will be on PS3, It looks a little better on PS3 and i won't have to borrow my room mates 360 to play GTA4.
I just bought a laptop from www.cyberpower.com for about 1600 after discounts that I'm very happy with. You could get the price down to 1500 no problem if you went without some of the upgrades (should still be able to play Crysis on it).
here are the specs:
Xplorer X7-7700 Notebook...