Need new graphics card

I finally decided to go back to hackintosh on my comp. I used the ipc disc and updated to 10.5.8 using the ideneb combo update and am currently using the voodoo 9.5.0 kernel.

The problems is the graphics card. The only reason I was using the windows operating system was for a few rts games. Well after installing command and conquer generals and the zero hour expansion the game sort of chugs on a low resolution and when pushed to it full resolution the game menu lags extremly badly and upon starting a game the screen flashes blue and the game crashes.

On windows I was EASILY able to run this game on full settings.

I want a new graphics card that can play this game on my hackintosh perfectly with full settings can perhaps command and conquer 3 which is much higher graphics.

Oh and for drivers I used the universal installer and aplied the EFI string for my card. All other options are a no go for me and cause the system to drag and not allow the game to play at all.

My sustem specs are
CPU: AMD Athlon 3800+ X2 OverClocked to 2.5 GHZ
Mobo: Asus A8N-SLI
Graphics card: Nvidia 6600 512 Mb
Ram: 2 gigs