I wouldn't be considering a DSLR for planetary work.
For the sort of money you're talking about I'd get a mono webcam such as a DMK21AF04 and look to hook it up to a filter wheel and RGB filters (possibly second hand) to do some imaging that way.
Or if the thought of RGB is a little too much, get a dedicated one-shot colour imager like a DBK or 2nd-hand colour Lumenera camera.
You could try a ToUcam to get the hang of one-shot colour planetary imaging, to get you started. Much cheaper.
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