Camera Advice

[Celestron4]

I am looking at getting a new astrophotography camera and was hoping for some advice. I currently use a Canon DSLR which has worked well with my 6" SCT (I use a focal reducer which brings it to F6.5, I think) so far but its limitations begin to show during warm nights during the summer and as I move towards more 5 minute exposures. What are my best options without having to spend too much? (preferably under the £1000 mark).