Having a lot of experience and grey hairs means two things, continuing to make a lot of mistakes and having grey hairs!
Having said that I will weigh in. The top lunar/planetary imagers often use C14's, the regular model. I won't rave on, but just give one example, Damien Peach.(Check out his website.) This is where they often operate in collaboration with professionals. So you don't need a gazillion dollars and really special equipment. What you do need are very steady conditions that are hard to come by, and video imaging technique where you grab and stack the best frames.
As a Neanderthal, I have attached a camera to the C14 with 2 X televerter and got some 'happy snaps' but as single images, they still have that 'softness' to them. Now Damien Peach has a lovely image of the central crack running down the Alpine Valley....wow! To see it alone is an achievement, but to image it as well.... Okay he does take his scope to Barbados annually for imaging in the wonderfully steady conditions.
And so it is not only the size of your scope, but what you do with it. Damien was using a C9.25 some years ago and got remarkable results also.
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