I am looking at using Nema23 4nm from CNC4You which look to be low inductance and high torque also nothing really shows the torque curves to show if it is usable power through the range.

Has anyone used these motors at all ?
These are the one's to go for, good choice and the AM882's are also good.

In general 1605 screw on Z and 1610 on X and Y . I have used 1:1 on X and 2:1 on X & Y (router twin screw)