I agree, any camera from a mainstream manufacturer like ZWO or QHY should just work. I have never had a problem with my ZWO ASI294MC, or my QHY guide camera, but the choice depends on what sort of imaging you want to do. I won't open up the can of worms that is OSC vs Monochrome, but if you do get something like ASI1284 I would recommend the Optolong L_Enhance filter for nebula and other Ha rich targets and the L_pro for RGB targets like galaxies, clusters etc. Unless you have very dark skies. I also upgraded from an EOS 1100D a few years ago and the improvement is huge.