Everyone else here will be able to give infinitely better advice than me, but I will give it a bash.
For entry level astro, refractors seems to be the easiest from what little I have seen, just for the simple issue of getting things into focus is you go afocal photography (Camera mounted on the focuser rather than imaging out of the eyepiece). Reflectors used for visual don't have enough inward focus to get a camera working as standard. That heads you towards cutting the scope down and its really not an entry level choice.
Refractors do have this, but generally are a lot more expensive than reflectors. A decent 80mm refractor is like 600 bucks, which is a large portion of your budget. Too large for astrophotography.
I would simply go back to the tried and true advice of 8" Dob. You can get a few bits and pieces which will allow you to take photos of bright objects allowing for short exposures where the lack of tracking is not as much of an issue.
Something good enough to have blown up and put on a wall? Well thats up to your pride in it. It's obviously not going to be the works of art we get as image of the month, but if you like the shot thats up to you.
Hopefully someone here can show you what images they managed through their dobs, as I only have a couple of eyepiece projected shots with my iPhone.
(From what I have seen Astrophotography is a good way to get poor but with lots of really nice things to keep you company)
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