I've ordered a SAPPHIRE 100186L Radeon X1950XT 256MB from the Eggmasters and I'm awaiting delivery next week. Maybe this will add approx 600 Points Per Day (PPD) on top of my production.
FYI my main cpu is a Opteron dual core 170 at 2.70 GHZ with 2 FAH sessions running. When I get the new video card I'll just run one FAH client and the GPU session.
That's some serious hardware!
Kepe an eye on the 256 MB version of the X1950. Some folks on folding forums think that you need 512 MB of video RAM ...
Run one GPU at 90%, dedicate a core to that GPU and let 'er rip. Add in the second CPU once the GPU is set up and optimized.
Check out these threads for more info:
http://forum.folding-community.org/forum54,windows-gpu-client-core-issues.html