does anyone actually know what the best Nvidia card would be for just physx ????
8800GT ? 8800GTS ?
You do realise this is "unsupported behaviour"? It means that at any point or update nVidia could turn your planned purchase into a paperweight - just like the PPU..
Until nVidia come forward with an official statement that says they'll allow AMD GPUs, then I wouldn't buy a nVidia card for Physx if I have an AMD one already.