Before spending *any* money, I'd have a go at processing some of the raw files, fits files etc. posted here and other places and see how you go with processing them.
Capturing the image is only half, actually I reckon way less that half the story. You will often spend way, way more time processing than taking the images in the first place!
The processing is the harder bit, and if you don't enjoy processing you probably won't enjoy astrophotography all that much
Have a go at some planetary and deep space raw files and see how you go. Then you will have sorted some of the software you need and some of the techniques before spending any $$ and you will get a better idea of what's involved etc.
Processing can be a lot of fun, but can also be a bit daunting, tackling it before you get a camera can make it a lot easier when you do start shooting to understand better what you need to do at the scope.
Just my 2c.