http://www.geforce.com/#/Optimize/Guides/how-to-build-a-kick-ass-crysis-2-pc-for-under-600
It can be done. Easily.
Additionally, I went ahead and checked:
Xbox 360, 250gb, brand new = $300.
12 xbox 360 games, brand new = $720.
Desktop PC, built, 4gb ddr3, GTX 460, 250gb = $650...