It's a good system, other than the video card.
That video card isn't made for gaming; it's made for watching HD movies. So you won't be able to play any high end games like Metro 2033 or Crysis. You can still play some games though, but they would be in low resolution and settings, no AA/AF, around 30fps.
If your buying from a Gaming PC website, go for a quad core like Phenom II X4 or Intel i5 2400/2500 instead of a hexacore (unless you do encoding and media editing). Stick to 4GB RAM. Get a 650w BRANDED power supply, like Seasonic, Antec, XFX, Corsair, unless you are going to Crossfire/SLI. A crappy power supply can fry your entire system! And get 64bit Home Premium.
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