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Another option you don't mention is to use an Off Axis Guider with the RC8 and just swap the guide camera over when you are imaging with the RC8. I am only just setting up my system (Celestron C8 rather than RC8, but otherwise the same setup). I think the EQ6 will run ok with all three but haven't tried it as yet only the ED80 + 60mm combo (which worked well).
I am told for the longer focal length scope you have to be very careful with flexture between the guide scope and imaging scope which the OAG prevents but at the cost of possibly making finding guide stars difficult (haven't tried mine yet so no experience there).
Happy guiding
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