GPU photo edit

Hello Richard... Welcome to the forums.    

Depends on your budget, the resolution of your monitors you will use, and what else you would like to be able to do with your new build in the future aside from Photoshop CS3.

I would generally suggest a configuration with at least one NVidia GTX 670 for good multi monitor performance just using a relatively demanding photo application like Adobe Photoshop CS3. One GTX 670 or one GTX 680 could run up to 4 displays, and should remain a high level performance GPU for several more years. If those 2 monitors were both large 2560 X 1600 30" displays for example, then you might want consider using two 670's in SLI for better multi monitor performance at max resolutions.

Hope that starts the ball rolling for you. Look at the Digital Storm Ode V2 line as the best value and bang for the buck. Don't be too worried about exceeding your performance requirements a little, as that may help this new build last as long as your old pc did before needing upgrades. Going to a new LGA 2011 platform from a 6 yr old pc should be quite an enjoyable experience. You came to the right place Richard, as Digital Storm builds awesome computers and they have excellent in house customer service & support.