with those specs you posted, I say go for the 360. I'm a PC Gamer myself, but I personally would not recommend it unless you're willing to commit to upper tier right components right now. Yes, $500 builds are viable, but with a Radeon 6670? You'd barely get 30 fps on Metro 2033, let alone Crysis 1. True, you can cut out DX11, lower the resolution and texture quality, disable anti-aliasing, and then what? You'd end up with XBox360-level graphics.
On the other hand, if you plan on MMORPGing, or play Team Fortress 2, those specs would be sufficient.
On the other hand, if you plan on MMORPGing, or play Team Fortress 2, those specs would be sufficient.