Any good controllers for small servo powered cnc mill?

I have an old Pro light by Light machines...its a nice mill...BUT the
controller is just a headache and a new one is big $$$. I would like
to be able to use the existing amplifiers, but am having trouble
finding a nice controller that will work with the servo amplifiers that
exist already.

I would love to use a Mach 3 or other Mach (not sure which would be
best) but it seems the only way to do that would be to buy 3 new
amplifiers that convert step and dir to servo. IS this the only way to
use Mach 3 or is there something new? I really would hate to spend
$300 when I dont really have to.

Thanks,
Todd