Chris,
The Moonlite focusers are excellent. I don't know much about the Celestron focuser you have so hard to comment on what is better. If I was in your position I'd get the Moonlite upgrade. The Rigel controller is going to cost you US$64 + shipping.
http://rigel.datacorner.com/rigelsys...tornfocus.html
You can see the Moonlite slip clutch system in the "motor option" photo here:
https://focuser.com/products.php
This allows you to manually focus by dis-engaging the motor. Most motorised systems don't have this feature.