Hi Chris,
Congratulations on your first images, they are better than the first images I took. The equipment you will need for prime focus astro photography depends on whether you want to image deep sky or the Solar System. Not sure whether the words, relatively cheap and astrophotography, gel that well together.
I think the key is to look at what other people are producing and the sort of gear they use, to get a better idea of what might suite you. Its a steep but most enjoyable learning curve, have fun.
Regards
Trevor
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