Help Building Hackintosh's Graphics card, Advice Please

I'm looking at the following build:

Gigabyte GA-P55M-UD4
Intel i5 760
A-DATA XPG 4GB (2x2GB) DDR3-1600+
Cooler Master V6GT CPU Cooler
Western Digital 1TB Hard Drive SATAIII 7200rpm 64MB Cache - OEM Caviar Black
Samsung SH-B083L 8x BD-ROM with DVD±RW DL SATA Blu-Ray Drive - Retail Box Black
Lancool PC-K62 Case
CORSAIR TX650WCMPSU-650TXUK 650W 80Plus PSU

Click to expand...

I'm now getting a bit confused on choosing NVIDIA's or ATI's Graphics Card for gaming in Windows, and full working in Snow Leopard. I've got a number of options and looking for. I've been looking at
- nVidia GTX 470/480
- nVidia GTX 460 1GB *2 (Form SLI)
- ATI 5xxx series

Will the Fermi's Card work in Snow Leopard as I also want to use PhysX and CUDA, which is the tech of Nvidia in Windows ? Will all the above work using the latest Multibeast? Or using CustomBeast?

Why don't you try the New Custom MacBuild by tonymacx86?
http://tonymacx86.blogspot.com/2010/08/ ... -2010.html

If only i have extra budget... I'd go with this...