Kepp,
I've got a 400D and a DSI II pro (mono with filters) and they are a completely different imaging experience. The 400D is great at a dark site where light pollution doesn't impact things however at home in the suburbs the DSI can do a lot longer exposure without being overcome by light polution. The mono with filters is a lot more work to produce a colour image than one shot colour in both the imaging and post processing. There is also a big difference in the imaging chip size and hence field of view - the DSLR is a much bigger chip. The other consideration is the scope and whether you can achieve focus - typically you need to modify a Newt to achieve focus with a DSLR.
Peter
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