Hi markswell,

There are various graphic cards that work very well with OSx86. However, your decision should depend on your requirements.
How much performance do you need? What is your range of application?

For instance, I use a NVidia 7600 GT 256MB. It works flawlessly and I never had any problems. It has enough power to enable smooth Quartz Extreme & Core Image, and works fine for design and development. I don't know how well this card can be used for gaming, because I don't have any experience, but I suppose a 8600 GT could work quite fine for that purpose.