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Joe,
I reckon you need to keep the FL at 2000mm or less.
Hence 16"f5, 18"f4.5 or 20"f4. I chose 18"f4.5 and it is a perfect fit of portability and aperture. It will even wheel through the back door of my garage! At this FL the average person only needs a milk crate to reach the eyepiece when scope at the zenith.
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