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Agree you should go for the best mount you can afford.
RC8 is a longer focal length instrument - so harder to guide and focus.
Many of the big bright objects are much larger than the field of view that an RC8. An ED80 refractor would be a very good starting point.
As for guiding - the SSAG connected to the Orion guide scope, or even the finder guider would be suitable. The software provides sub-pixel guiding accuracy, so a long focal length guide scope isn't required.
DT
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