Call of Duty 4: Modern Warfare

[Super Buu]

I didn't pay much interest to this since I'm not much of a FPS guy, and I kinda automatically dismissed it as probably being another war simulator since it was a Call of Duty game. But all the hype has finally made me have a look, which culminated when an excited friend showed me a video. It looks pretty cool.

My comp specs aren't that good (1gig of ram, 3.4ghz processor, and an old Nvidia Geforce 7300 LE for my graphics card) but I can't go online with my consoles at university. Should I get this for 360 or PC?