Eck, i wouldn't recommend the MX series, it doesn't even support DX8. Get a lowend Ti series geforce4 if you want to upgrade. Personally i use a radeon 8500 and the computers i build i've been putting 9800's into. They have scored well on 3dMarks03, and can do pretty much everything i throw at them. the 8500 series is cheap now as well, and they serve me very well.