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The 12" dob is great, you'll notice some drop off in light gathering and probably a loss in portability, grab n go etc when you move to a motor driven mount, SCT etc.
Not to mention the wide field, contrasty views offered by a newt.
I can see the desire to get a motor driven mount, but have you considered getting an EQ mount for your dob, if you want tracking? Have you considered getting an Argo Navis for your dob, which in effect gives you goto (except it's push-to)?
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