For your budget, I would buy a mount - probably a second hand one to get the best mount you can for your money.
Possibly not the answer you were expecting...? Hear me out! You could put your DSLR on there and take some
superb wide field shots. Even perhaps with a 200mm or so lens, it should be possible to easily take 1 minute unguided shots with careful polar alignmnet, which when 'stacked' could easily be capable of competition-winning results.
In time, you could then maybe add a wide field refractor and try longer focal length imaging, and learn techniques such as autoguiding to overcome all the technical issues that imaging at longer focal lengths generates.
To try and equip with a guidable mount, and a scope for imaging, and an autoguider on such a budget would probably only lead to compromises in equipment capability and frustration
Regards,
Rob