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The overriding factor is how much and how far you are interested in doing quality AP. That determines what level of quality is acceptable to you.
I think you work these systems out in reverse. What type of image do you want to produce? At what standard? What would that require? What posted images do I admire? What equipment did they use? What is my budget? Where will I image from and what are the conditions there?
If you live in suburbia then high end deep sky imaging with any setup is unlikely to yield the high end results you may want. You would need to go narrowband which has different choices of camera and filters.
The cost of good gear is coming down with many CCD manufacturers now, GSO RCs being quite good etc etc.
The sequence is 1. A good imaging location. 2. A good mount. 3. A good camera 4 a good scope.
6 inch APO is the sweet spot for refractors but they are usually expensive although I see APM offers some 6 inch APOs that are likely to be very good.
Greg.
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