Just wanted to take a moment to thank everyone who helped, I'm now up and running with my first Mesa card (big step from Parallel

)
The machine is faster, feels smoother and just as accurate.
Also whoever (I think it was probably TommyLight) suggested Dell Optiplex 7050's I was stunned and pleased to find out you can get them on Amazon for $150 and the latest Debian/LinuxCNC loaded without a hitch. I see all my machines getting upgraded to Mesa and Dell soon.