Hey Tim, sorry but that isn't even working successfully, here's why:

Core Image: Software
Quartz Extreme: Incompatible

No QE/CI, that means the driver doesn't work correctly, you will need it for a good Leopard experience!

I have also done a little research about your card, but there aren't any good guides about your card anywhere... At least that's what it seems like. Don't give up though!!

If you'd consider to buy a different card, what would you need it for? Only OS X? If so, then I reccommend XFX 7600 GT. Not expensive and nice performance.

Kind Regards