It's really important to think about the objects you're most interested in and determine what FOV you need to frame those objects and work from there.
Also, bigger is not always better
maybe I'm old fashioned, but if you're just getting started I'd suggest getting an equatorial mount and start by mounting your camera and whatever lenses you have. Then maybe start with a small scope, and work your way through objects. The FOV is determined by the focal length of the lens/telescope you are using, as the size of your camera sensor is fixed.
If you go with a refractor, go for a triplet/quadruplet/quintuplet lens scope that corrects all the colours and flattens the field nicely. These don't have to be expensive...the WO Star 71 for example is about US$1000. I have no experience with newts, but an SCT wouldn't be my first choice for imaging because of the long focal lengths.
The main challenge with working with long exposure astrophotography is that you need to have a good polar alignment. All the gizmos in the world can't help you if you're polar alignment is too far off. A longer focal length telescope exacerbates the error/drift (hence the SCT comment above).
Good luck!