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Not sure what you mean by perfect polish on the lens. SCTs are generally more useful just because they can be used for planetary as well as DSO with the correct flattener and they're significantly cheaper to Maks. Do you have a mount already? If so, what is it? this will also determine how heavy your scope can be before it starts to overburden your mount. If you don't have a mount, for $600, you're probably limited to a second hand 8" dob and manually track planets as you record the video with your camera. Altough I'd make sure that the dob you're buying can come to focus with your camera as many are designed for visual use only and does not have enough in focus most of the time without having the primary mirror moved up.
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