Servo Drive Question..Help!

I am currently setting up a bridgeport for CNC operation and I
intend on controlling it with Mach1 on a PC. The servo motors I have
are Allen Bradley 40.5 in/lb motors they are rated at 2500 RPM and 13
Amps continuous and 30 Amps peak. 40 volts/K Which makes them about a
100 volt motor. The encoders are 5 volt/160 MA. I need help on
locating the proper drives for these. I spoke with the tech at Gecko
and he said their 320 or 340 drive would work however, I would have
to run them at a lesser voltage to accomodate their drives and their
20 amp limit would not be an issue as their drive will only allow 20
amps thru. He went on to say that this would effect acceleration and
top speed but they would still have about the same torque. This is a
4-axis machine and I'm only running 3 of these motors as the "A" axis
(rotary table) will operate with a smaller motor. I'm needing some
direction on a suitable breakout board. Ive looked at the PMDX 120
and the Sound Logis Mach1 board. Which one of these boards is better?
for My application? If someone would, just breifly outline the best
affordable configuration i.e. Breakout board, Servo drives and Power
Supply. What voltage and amperage would you suggest using the Gecko
320's. Any input on this would be greatly appreciated.

Ron