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Andrew,
using a DSLR for DSO with a 10 inch you're probably going to want to take subs of usually anywhere from 5 min to 12 ish minutes. Of course you can get subs at about 1 minutes without much trailing if your polar alignment is good but even stacking heaps of these will only reveal so much because the longer the exposure the more faint stuff you capture.
Renormalised is right in that you will really benefit from a guide scope (and a guide camera)
The CCD option will allow you to avoid the guidescope if it has internal guiding as the SBIG cameras have.
hope this helps
frank
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