Hi Craig,
My advice would be to decide which mount first. I run an 8” f/4 on a HEQ5 pro and although not impossible, it has been hard work and taken a reasonable amount of time testing etc to get it to run smoothly and consistently because of the weight. Like I said, not impossible but I’d imagine quite frustrating for a beginner. I sometimes think if I’d had my time again if I would have either bought an NEQ6 or stuck with a 6” f/5 which would also have been easier to collimate. I haven’t used an ED so I can’t speak for them.
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