As I have not built a machine yet, I can not offer suggestions for your electronics and motors. However, for others to be able to help you, more information is needed:
1. What is the design of you machine?
2. How large is your machine?
3. What is your machine used for? (routing PCB's, carving wood, milling aluminum, machining steel)
4. What tolerances, speeds are acceptable?
I'm sure others will help, if they have the right amount of information. Good luck with your quest.