If you can afford it, upgrade everything, since it'd also give you a much wider range of options to choose from and give you an overall better performing PC as well. If your budget won't allow for it, then just get the video card. Give me a PM and tell me your budget and exact location, and whether or not you'd be willing to buy online. I'll suggest a suitable build for you based on that. It would be offtopic in here and would just serve to confuse people as to the purpose of this thread.