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Query (agreeing with what Peter said above) - if you mainly want to do visual - would a large goto or push to dob not give you more satisfaction if your targets are nebulae? Aperature rules - that points to the dob especially for faint nebulae. A long focal length SCT on a fork mount that is mobile presents challenges for astrophotography. You'd need a decent amount of skill, equipment and patience getting it all to work in the field - do able - but certainly not easy. You'd need an OAG (at that focal length) plus 2 cameras, cables, wind shelter, de-rotators, wedge, PC, power etc. Then you'd have to tune it to remove all differential flexure. As I say do able - but not simple.
If you can draw a line between visual versus must be able to morph to do astrophotography - you can spend your $ with far more effect.
My opinion - Matt
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