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Can we say that most of the time we are better of with dedicated CCD preferably cooled CCD over DSLR in the same price bracket.
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CCD will cost you alot more, dslr is the best bang for buck. When you get into the 2K+ range though a dedicated astro ccd will yeild better results, though its very debatable as i've read a few reviews with ~3K ccd vs dslr and some people like the images the dslr's cmos produce over the dedicated astro ccd.
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And mono will capture more data over colored CCD.
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Yes you will see way better results because of how a color matrix works vs mono. You can still get very nice images with OSC's though a mono at the same price bracket will more then often eat it alive. So there nothing wrong going color and many many people use them and they are a great way to start and produce extremely nice images. The only problem with OSC systems is a dslr will more then often be way better vaule.
Heres what QE is
http://en.wikipedia.org/wiki/Quantum_efficiency because i'am not expert lol ill let you read it and see. Please remember that i'am no expert and just giving the best advise i can from the little knowledge i have, hopefully a veteran can rectify anything misleading or wrong.
In this pic you could say that relative response is where QE is though not in scale as this is in comparison of a 618ala
Basically if you had a sensor with 30% qe and another at 60%, the one with 60% would only need half the time to get the same exposure. I maybe wrong there on the time though it will get it faster, where are the dam experts lolz