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Nice looking scope. Newts typically need a coma corrector. Do you have one of those? MPCC is common one used.
Sounds like you've got the CCDs worked out there. Its just a matter of going through the pluses and minuses of each and which match your intended main interest in imaging. CCD calculator at New Astronomy Press (its free) gives you a simulation of the view of different deep sky objects with different cameras on the same scope. That may help with the decision process.
ST8300 is proven.
SXV694 seems to be a strong performer but a bit smaller FOV which might be good for galaxy images but not so good for wider objects. Its also very modern, has good electronics, its a Sony sensor. Mike S likes his and Rally's few images posted so far are impressive with a similar setup. It also requires a smaller corrected image circle not that KAF8300 requires a large one either. KAF8300 is about 58% QE and not sure what its QE at Ha is. 694 is 77% and 66% at Ha which is one of the highest around.
ST10 is another strong performer plus it has self guide (I presume). That is good for LRGB not so much for Ha.
Greg.
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