I am using a 400 watt spindle (http://www.ebay.com/itm/261878403099?trksid=p2057872.m2749.l2649&ssPageName=STRK%3AMEBIDX%3AIT) and 48V supply (http://www.amazon.com/SMAKN®-Regulated-Switching-Supply-Quality/dp/B0113JHSRO?ie=UTF8&psc=1&redirect=true&ref=oh_aui_detailpage_o01_s00) on my MPCNC.
I created power supply cases for the spindle controller and power supply plus mounts to fit the update tool mount that includes a magnetic dust shoe.
This is a bit more expensive than the Dewalt router motor but it is a good performance option for the updated MPCNC.