The desire to have just one telescope for both imaging and visual is very common. The problem is, those are two different things. _Learning_ imaging is even farther away from visual.
The camera works, not because it's better than your eyes, but because it's very different. Your eyes need aperture to gather light fast, and don't care a lot about tracking errors. The brain compensates. The long exposure camera is a different story. Aperture is not as important, because its tool for gathering data is long exposure, _very_ precisely tracked. Dumb .005mm pixels are completely intolerant of tracking errors.
Compromise is difficult. An analogy. A pro photographer has two assignments. A professional soccer game and an indoor wedding. He needs a long telephoto for the game, a wide angle for the wedding. Compromising on a short telephoto will likely get him fired from both jobs.
My best suggestion with your budget, for scopes. The $469 AT72EDII for learning imaging. An 6-8 inch Dob for visual. It falls under "use the right tool for the right job". If you want to start with visual, just get the Dob first.
I didn't invent that idea, I stole it. <smile> Scroll down the page to the picture of the very expert author. That's a $500 70mm refractor on a $1200 Sirius (HEQ5Pro) mount. He didn't choose them because he had them lying around. <smile> That's nearly an ideal setup for learning imaging with a $1700 (plus camera) budget.
Whatever you decide, this book will be a big help. DSO AP is wacko unintuitive, the very low signal to noise ratio, and the long exposures change the game.
Edited by bobzeq25, 17 May 2020 - 10:43 PM.