Here are a couple of websites that have some motors that will work well with the G540:
www.kelinginc.net www.homeshopcnc.com www.camtronics-cnc.com
If you have any questions you can shoot me an email through our support page at
www.geckodrive.com or give us a call at (714) 832-8874 and we can help you out.
Marcus Freimanis