Just replace the entry for "driver" under section "Device" in your xorg.conf with vesa or nv. Once the card has been installed, you can install the proprietary nvidia driver.
Budget card? That depends on what is your budget. I'm using a 7600GST and it works really well. Of course, 7600 isn't DirectX 10 unlike the 8500 or 8600 but as long as you haven't got any plans of using Vista on that computer in the foreseeable future, that doesn't have any added value at all.
Last edited by jay73; 11-16-2007 at 11:14 AM.