Which GPU should we buy?

Hi,

we are doing some research about the GPU. We will try to implement

some algorithms on the GPU. We do not know yet if the algorithms

really fit for the GPU architecture.

I did some research back in the year 2009 using a FireStream 9250

with Brook+, but I noticed this model does not exist anymore.

So what is a good card for GPU computing these days? Maybe we do not

need the  most expensive one.

And do we need two cards? One for GPU computing and one for the

usage of the monitor. I remember 2009 the driver crashed many times

doing GPU computing.

Thanks for your help,

Piotre