[aarggh]

How about these? with dm542 and 48v psu?

ACT Motor GmbH 3PCS Nema23 Stepper Motor 23HS2442 Schrittmotor 4.2A 112mm 3.0N. | eBay

http://cnc4you.co.uk/resources/Stepp...1B%203.1Nm.pdf

http://cnc4you.co.uk/resources/Stepp...8B%202.2Nm.pdf

there is

23HS1442 model with a inductance of 3.0 value but has a smaller shaft of 6.35mm. I prefer 8mm.

You can get more optimal, bringing you closer to the max possible match, but those steppers are really good and will be more than capable of pushing a few hundred kilo's around!

cheers, Ian