Jawed
Legend
Considering how weak, in GFLOPs, the GTX260 is, I expect you'll be running graphics at "low" or at low resolution (i.e. less than 1920x1080) in order to get any use from the "physics".2nd : physx, It could amount to nothing but considering im poor and may have to live with this card for the next 3years I didnt want to take the chance that I would be without it.
Currently buying a single card for physics is a worse prospect than buying an 8800GTX to play D3D10 games, before any of them were released. Remember how that worked out?
I can't help think that with NVidia's currently available cards the only viable configuration is 1 card for graphics and 1 card for physics.
Jawed