We are eyeing the same camera for deep sky (ASI1600MM-C). But I'll need a guide cam anyway so thought I'd get something that could be used as a guider and for planets.
I had a quick go at imaging planets with the 1100D, didn't work well at all, but I might not be holding my mouth right.
I have more success with C-mount video cameras.
Anyway won't be getting anything for a while. The 1600MM-C will take at least until x-mas to save for, if not longer.