Thanks for your reply!
The QuadroPlex option is clearly out of my price range. As it is for most of humanity
A catch I noticed with the Matrox device is that I will have to have a video card with two DVI-D connectors on it to achieve 1280x1024 resolutions on all three monitors. See compatibility sheet
Where will I find a GTX series that has two DVI-D connectors or should i be looking at a 9000 series card?
If I went back to having two cards (each with 1 DVI-D connector), do I again run into having to use Xinerama?