What size Stepper motor for my CNC Wood Router

Hi all.

After many days of reading and researching, I may have made up my mind what Stepper Motors and Drivers to get for my self built CNC.

I have taken advice and picked NEMA 23's for all Axis & DM556T for all Drivers, my only concern now is which power should I choose, 0.9, 1.9, 3.0 Nm bearing in mind I will mainly be cutting wood for my guitar bodies, sorry to be a pain, but I need to get this right first time due to cost restraints.

Regards.

Ray.