ask for suggestions on video card for CUDA applications

Accelerated Computing CUDA CUDA Programming and Performance
1

Hey,there!
I am a newbie to CUDA
i was attracted by CUDA’s high performance, and believe CUDA might help alot on my current project, which involves tremendous FFTs
to start with, i have to purchase a video card supports CUDA first.
i dont play game, and the major computation for me is FFT, Hilbert Transform, interpolation for image reconstruction, and may be a simple 500500500 solid volume 3D display after it is reconstructed
the budget is <1000, thus a video card is preferred,
so, any suggestion? 280GTX or 9800?
or can i put two or 3 cards for a SLI mode computation?

2

SLI is not supported (not automatically, but you can partition your computation manually). Go with GTX280 (or 260) since it has some new features over the old generation.