mfcphil,
This litle trick of offering just enough PSU and other things allows all the manufacturers to have you trade in rather than upgrade. I ran into this very thing on my Gateway GT5220 and it turned out to be way more trouble than it was worth. Yes max'g out the ram and adding a small GPU will help but in the end, case design and component upgradeablity will hamper the build, IMHO. Go light on this upgrade and save back some bucks and stay here and get some great education on builds and start thinking about your ground up build ! We're here to help you and the learning process and quality differences in the components will blow your mind.