Upgrading from a Geforce 2 MX to a Geforce 3 Ti-200 increased my 3dMark 2001 scores from 3259 to 7100.
You wouldn't get that high because of your processor, but should be able to drive over 3000 with a Ti-200, which should drive MOHAA at a reasonable resolution, with most of the eyecandy turned on, at about an avg 30 to 33 FPS.
If your worried about money look at the ATI 8500. Similar performance to the Ti-500, but $100 cheaper. The problem is with an 8500 or a Ti-500, your CPU will become your bottleneck and you may not have the horse power to pust the full capabilities of the card.
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Remember Dieppe
