I started out with a C8 (non edge) but went to small refractors to try my hand at DSOs. Once off the reasons was simplicity - no collimation worry about, so one less thing to go wrong. Given how many issues I had early on, I wish I went the "stay simple until you have some form of result" path earlier.
Something like the little ED80s are great $/result and a great stepping stone, but not really appropriate for planetary (super portable, though). I believe the ED80s with 3" focusers will fill a full frame. They are easy to pick up second hand.
C9.25s great for planetary, but a much bigger spend, less portable, and you already have access to a C8 to compare any other scope with to see what you prefer.
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