What is wrong with your current OTA that makes you want to change?
I would think better options would be (in no particular order): electronic focuser, cooled camera, better mount
If you go with the RC8 you would do better with an EQ6 class mount plus I'd add an OAG, collimation ring and focal reducer.
With your current OTA or the RC6 the HEQ5 should be ok - especially if you use an OAG.
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