Didnt look at the link, just googled the mill.
you can use 3nm motors on the X and Y and a midle size nema 34 on the Z, but, if you can fit smaller nema 34 on the X and Y, i would think it would be better.
you can also gear the X and Y with a 2:1 as well if using a 3nm motor
This will add to the resolution and give you a but more grunt as well.