Ps3 vs xbox 360 vs laptop?

i want to buy one xbox 360 or laptop.
laptop spaces-
intel core i5 @ 2.26ghz
4 gb ram
500 gb hdd
ati 5650 @ 1 gb
windows 7

or xbox 360 or ps3.
i want to games like gta 4, crysis 2,just cause 2 etc.
i want to best network games for windows live vs xbox live vs psn.
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