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You just cant beat a cooled CCD for astro imaging... The benefits however depend greatly on your ability to guide for a long duration.. If your setup is only capable of 2~5 minute exposures, you wont get much more from a CCD than you would from a DSLR, however if you can push it out to 20~30 minutes, the DSLR's get left in the dust...
Depending on what CCD you look at getting, you may not require dark frames, even for exposures of up 1hr duration..
There's a million pro's and con's to each option if you go digging and looking for them.. I used my DSLR for astro imaging about 7 times... I then bought a CCD... Wouldn't go back... wouldn't even go to cooled, astro-modified DSLR over a CCD...
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