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Lots of good advice here. The issue John raises about the focus in fast scopes is very interesting too.
If you have a trailer and little to no respect for your lower back, you could lash out and get a 20" dob. I only use mine once a month at a dark site, but once it's cooled the views are phenomenal. If you plan to use it more regularly in the back yard, then something in the 10" - 12" range is probably more feasible. As many others have said, it's whatever you can move/afford which will dictate the scope you get.
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