Chris,
You should consider whether a stepper motor would be a better investment than a simple DC motor if you are going the upgrade route. The stepper will allow you to use autofocus if you ever get into astrophotography and if you ever decide to sell the Moonlite, the stepper variety will appeal to a wider market than the DC motor option.
The main downside of the stepper (apart from the cost) is you need 12V power to run it whereas the DC option probably runs off batteries in the control unit.
I think you can also buy a stepper kit in the future and replace the DC motor yourself without having to send it back to Moonlite however this would end up costing more having bought two motors.
Just food for thought!
Peter
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