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As Jonathon says, medium/large newtonians hit the sweet spot for resolving planetary detail. But, only if they have high quality optics on board. Merely upgrading to a larger aperture will achieve nothing or worse, if the optics are poor. There is a lot of information out there that indicates the quality of the mass produced mirrors deteriorates as the aperture increases.
If deep sky is your passion then the 20"GSO would be worth a look when they come out. But for lunar and planetary, the best setup is a premium mirror in a Dob platform that tracks for easy high power observing.
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