Best bag for the buck software for servo drivers ? (Gecko)

I'm about this close "--" to purchaseing a servo set up for my
mill/drill CNC conversion. (Gecko's)

The part that I am now struggling with is the software to get to make
parts and run the servos.

By day I'm a Pro/E user so drawing up the part is a no big deal.
I'd like something that I could simply import my files into
(iges,stl,dxf....etc) and plug into the computer running the CNC.

Thanks,

Mike Mueller
Antioch, CA