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If you're going to go after DSO's, I would seriously consider about getting myself an autoguider and a good guidescope. Reason being that except for the very brightest of objects, like M42, etc...you're going to need one as your exposure times will run over a minute, if you want decent pics. Unless you like to take heaps of short subs and stack them. Guiding will allow you to follow the targets and also help eliminate things like trailing and such. Most of the DSO's are too dim to warrant unguided pic taking.
In so far as DSLR vs CCD, I think Kenny hit the nail on the head there when saying the DSLR will be of more use to you, if you find imaging isn't your style. However, should you decide to go the CCD route, a DSI II is a good start. You could also consider an Imaging Source DBK21 or DBK31 SSC (single shot colour) camera as well. Little dearer but a better camera.
Although, for starters, the DSI II is as good as any.
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