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I'd have to agree with Marc, astrophotography is the evil cousin in astro terms, it will gobble money like a drainpipe. IF you want to do astrophotography the mount is the single most important item, it's a big decision to commit to early on though.
5k will get you imaging
Having been here a little while, I watch with some amusement as different ones buy new scopes in search of the perfect image. Let me say it does not exist, each scope has it's good and bad points
Reflectors give lots of light gathering at a cheap price, but are finicky with collimation, need larger mounts, and tube flexure can create problems once you have reached a good level of competency and want to push into really long exposures.
Refractors, simple to use but good ones are expensive, plus your f ratio is usually higher requiring longer exposures.
Other mirror type scopes often have long focal lengths which require some expertise, focal reducers can be obtained, the cheaper end come with mounts and will allow you to get to the solid intermediate level, the more expensive end can be really expensive and again will require a solid mount... To which your budget will not extend.
If you are more interested in planetary imaging, huge newts are the most chosen, and because it is more a video imaging game the mount question is not quite so demanding.
For visual, nothing beats a monster dob. The bigger the better. You can get goto varieties and tracking platforms etc.
Back to marcs comment a solid mount and a refractor is where you wnt to be for imaging
Cheers
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