Before I start, I will apologize for posting something that has likely been asked a thousand times before. I have done research here and elsewhere, but I am getting conflicting advice/information.
As background, I've been a serious amateur photographer for 50 years. Last summer, during the lockdown, I finally started learning how to do astrophotography. Although I'm still very much a beginner, I believe that I've been a fairly quick study in learning about automated photo sessions, image stacking, signal-to-noise ratios in digital photography (shades of reciprocity failures during my analog days!), the use of Photoshop to bring out the best in the resulting images, and so on. At this point, I think I've pushed a Canon DSLR, Sigma 120-400 lens (my airshow lens), and Sky Watcher mount about as far as they can go. BTW, if anyone wants to learn some tricks to bore sighting a hot-shoe mounted iPhone as a spotting scope, let me know.
All that said, I'm in a position to purchase a decent telescope, something I've wanted since I was a kid. I've been considering the Celestron VX8 as what appears to be the best intersection of my price range vs. performance. Of course, I know that I'd have to get a focus motor, the appropriate adapter for my Canon bodies, and power supply adapter as well. However, in reading various articles and the books I've purchased, there are many that seem to think that a Newtonian reflector would be the better choice, or perhaps even a refractor. One thing that surprised me today was a comment someone made about "mirror flop" with a Schmidt-Cassegrain telescope - unless they're referring to the camera body, I'm at a total loss on that one.
With that said I'm seeking more experienced folks' advice. A couple of items:
1) I'm not afraid of a somewhat narrow field. I've learned infinite patience aiming a racked-out 400mm zoom lens at, say, the Pinwheel Galaxy, and taking dozens of ISO 25,600 images as I try to center it. A computerized mount will be a luxury, to say the least.
2) As you may have inferred from the above, I'm looking to go for deeper space objects as a personal and artistic challenge. I was happy with the image I got of the Pinwheel, for example, but it was clearly a small object in a wide field using the Sigma.
3) I know the VX8 is relatively slow at f/10. That doesn't bother me too much as long as the trade off is superior image quality and less work on collimating the telescope (that said, would it be?).
4) Regardless of the optics, I don't want to buy every accessory in the Celestron (or other manufacturer's) catalog. What, other than the power supply, autofocus motor, and camera adapter, are the essentials and the nice-to-haves I should be considering along with the telescope?
Thank you in advance for your patience and advice.