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How seriously do you want to get into it, Greg?
Ideal planetary scopes would either be a C14 (SCT) or a large newt (12" or so). Although any of those big 14" RC's would do well too.
In any case, you need to be able to bring the mirror down to ambient temperature with active cooling.
5x powermate is regarded as the best to get the long focal length you need for the best resolution. You can add extension tubes to really crank up the focal length. You don't need any flatfield converters or anything like that.
A big scope at ambient temperature, a 5x powermate with filterwheel + RGB filters and a monochrome camera is what you want. And then good seeing!
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