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Alex, if you go for a GSO RC, you're likely to need to replace the focuser to make your imaging not a frustrating exercise, e.g. with a Moonlite or similar. Go the OAG too - I very much doubt you'd ever have difficulties getting a guide star.
As for the mount, I had reasonable success with an RC10 and G11, so something in that class would be enough. You could look at the iOptron CEM mounts as a possibility.
I've got a 0.67 reducer (AP CCDT67) that works well with the RC10 too - "speeds" it up, etc. Might make it easier to match a camera to it, e.g. a ASI1600 (which I use) - or something better by the time you get to buying.
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