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Alex, get the RASA if cost really isn't an iusse. This is what you love. Forget about cars, refractors or slower reflectors. The speed of an F/2 will have you laughting throughout your entire workflow, and you will get results fast. Heck, even the learning curve is fun. Time's precious, you don't want to waste any of it on any of the things that come with "regular" exposure times. The sacrifice is basically around your star shapes.
I'm dabbling with a smaller setup, the C6 plus Hyperstar on a camera tracker (the iOptron Skyguider). I absolutely love it. Here's its first look at a DSO, to see what might be possible. Not that remarkable perhaps, until one considers this was the first attempt, was done with a planetary cam (ASI 174), uses no calibration frames, is a crop, and was set up, roughly collimated, aligned, captured and "processed" within one hour. 50 subs of 10 seconds each, through a UHC designed for visual, from my Bortle 4 backyard.
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