I'm not too good with how the tech specs work and everything, so I'm a bit shaky on how easy it would be to change out the things needed to do decently on upcoming games such as The Old Republic and what-not.
All you should have to do to make it a gamer is upgrade the video card (assuming the power supply is good enough)
That being said..it seems to that this pc is way over-priced. With shipping it is about $1200.00. After spending that much you then have to turn around and spend another 150-250 to turn it into a good gaming rig. For that much money you could get a lot better gaming set up