Hello,
I am located about 1hr drive from Quebec city and looking to convert my machine too. See my post in signature. It seems the best to convert is the ESS Smooth Stepper or the Centroid Acorn. In parts we talks about more or less 600$US.
You said you are on Mach3 now... why wanting to switch to Mach4 ? Its not alot of difference... what the conversion guy done on your machine ? Do you have pictures before and after ?
Regards,