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I generally operate off of sample images I like and what was the gear used. A very objective empirical approach rather than theoretical.
Which images do you like that were taken by gear you can afford is the million dollar question?
In your example 10 inch carbon fibre RC. I have seen many excellent images from these scopes.
Generally, smaller sensors are more forgiving of the optics. Large sensors start testing the correction of the optics and the strength and lack of flex of the focuser and frame of the scope.
Avoid closed tubes due to thermal currents if you can. Or at least make sure that have fans.
My Honders has a 14 inch tube and the optics are 12 inch plus it has fans as well as removable back cooling plates. The point being great care has been taken to manage thermal tube currents. Keep that in mind when selecting an RC type scope.
Greg.
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