Power Range of NEMA 23 Motors

I have to replace 2 of my motors(playing around) I was wondering what power range you can use on the machine(I know Inventables sells them) Thanks

You probably have the 140oz steppers, if buying new get the 75mm (case length) kind as they have greater holding torque. It is the stepper driver and supply voltage that govern power range. The stepper is just the tool.