I think I'm going to go with a G540, Super-PID and Mach 3.
Funny thing is we had a real old computer upstairs in a spare bedroom I was about to just throw in the trash.
Today after work I walked up there to look at it.
Windows XP, Pentium 4 2 GHZ, 1 GB ram, Geforce 6800 with 256 MB ram and the MB has a parallel port.
Perfect to just run a CNC.
So now I'm cleaning all the junk out of it and then defrag the HDD.