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Nice writeup Don.
I would add a couple of minor points.
Smaller scopes are less susceptible to the seeing. I have a CDK17 which I use for imaging but I did use it once for visual. It was horrible. The seeing just made any view really bad as the seeing was being magnified. Perhaps a low power eyepiece would help there. I'll have to try it again with a wide view eyepiece and a night of at least decent seeing.
APO's versus compound mirrored scopes. APOs give sharper pinpoint stars and more pleasant views than compound scopes. But of course APOs aperture maxes out around 6 inches cost-wise. I don't know you gain as much past 6 inches with an APO.
APO' seem to cut through light pollution better as well as perform better in poorer seeing.
Greg.
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