Thanks for the quick response. My budget is about $800. The problem is that I also need an operating system so thats going to be another $115. This computer already comes with one.
If you got that computer and added a decent graphic card, you'd be spending about $900 anyway. You can build an i5 system for the same price as the one i the example, and with better parts.
If $800 is a hard cap and you're going to have to sacrifice on the video card to make it ... you could always go with an AMD quad core setup and save a significant amount of money.