[AdamHeard]

Originally Posted by RoboChair

http://www.ebay.com/bhp/cnc-spindle-motor
or
https://www.amazon.com/s/ref=nb_sb_s...=2LEHNTN7VNJII

I would suggest a 2.2 kw water cooled one with ER20 collets. If you do not have 220V power you will likely require a VFD as well.
You will also need to make sure that you will have a mount to hold it.

We've been very happy with our 2.2 kw spindle from keling inc on our router for the last 5 years.

I just purchased an X8 (w/ x6 usb controller) from Omio CNC that came with the same spindle, and happy with it so far.