Mini Mill Conversion - best stepper drive choice

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Mini Mill Conversion - most appropriate stepper drive choice

A friend and myself are separately working on CNC conversions of mini mills. Mine is an old Sieg X2, where I intend to go cheap and use trapezoidal screws and Delrin nuts - kind of as an experiment to see what's possible. My friend's is a bit classier - one of the larger cast iron Proxxon mills, where he's using decent ballscrews and hence expects decent results!

We are both intending to use 3Nm steppers - which we presume from reading around the forum seem appropriate. What we would like some input on, is the best choice of stepper drives to use.

I know the AM882 is the drive of choice for a router, where you would be wanting to run the motors at 68v to achieve higher speed operation. My understanding however is that for a small mill, you're really not looking for such axis speed, and hence could quite happily run the motors at a lower voltage. This in turn allows lower cost stepper drives and power supply, as well as reducing heating effects in the motors.

Is this a reasonable argument? Or not? And if so, what are the "preferred" stepper drives and supply voltages for this type of application?

Thanks in advance for any suggestions!

Cheers
Graeme