I say go to ebay and buy parts, a nice dual core processor, nForce4 SLi x16 mobo and 1 or 2 GeForce 7900gs gfx cards =D its a nice ass gaming pc and not as expensive
Well...
Well I probably would choose.... macbook.
You can put windows in your macs ( I mean play games and all is no problem I'm writing you from an iMac with Windows Xp service pack 1) and you can customize your own Macbook HD,Graphic Card and so on...
I'd just browse different site and try going out to places to see the best one to you.
lol`
buy an old pc from ebay buy a better video card buy a flash drive of about 200 gbs and upgrade it lol get one with windows 98 and download windows xp that one i have that is fastest i seen and ull have good pc ill all be about 600 bucks for a good ass pc lol