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The 8" dob would be best bang for buck out of those 3. Easy to set up and operate, and 8" of aperture will yield nice views. Collimation is a bit of an art though, nothing to be scared of but certainly needs doing at least occasionally..The refractor would also be nice, with an easy alt mount. And would need no collimation. The newt on the eq mount would require the most work, set up and collimation wise, but, it would track for you..(I think) Horses for courses really.
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