Ok,
I see now where you are going with nurbs vs poly for creating mesh.
I did not know the difference between the two when utilizing mesh for cnc work. All I heard was that nurbs were good for hard modeling while poly was great for organic. I will be modeling mostly fluid wildlife scenes and animals... will nurbs suffice for that? I kept seeing these awesome reliefs and most if not all were being done with poly modeling.
I do not have Rhino but am running Mach 3, Vcarve and now Cut 3d from Vectric. You mentioned the ability to remesh nurbs based on the work piece while poly counts were non changeable. Why would you need to remesh nurbs based on the size of the work piece? Is this to increase resolution for larger carvings? Or to save file size by decreasing and increasing mesh just where you need it? I was going to model and scale up or down in cut 3d to change the size but it now sounds like it is not that simple.
Will nurbs give the desired results I need based on what I want to model and lastly

Is there a modeling program out there you would recommend besides Rhino (I' d like to stay with my cam program)
Sorry for the 1000 questions but you guys are a wealth of information!
Thanks