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The main advantage of the DSLR over a similarly speced CCD camera is the price, especially in the mid ranged cameras. A 600D, unmodded, will only set you back around $350-$500 for the body only (new) and the mods will cost less than that. Whether you'd want to cool it or not would be up to you. Try buying a CCD camera with 18.1MPix for that price...put a "1" in front of the 3 or 5 and add an extra 0 to the end of the price and you may be able to get one. Your DSLR is no mono CCD camera but it can certainly hold its own with OSC CCD cameras. The only advantage an OSC has over a DSLR is that it comes with the cooling built in, usually, and it's designed "off the cuff" for astropics. Most still don't match the DSLR pixel count wise. If you had a 60Da, which you can pickup for under $1100 if you know where to buy, you could build your own cooler for it for peanuts and get a cooled astropic ready camera for a lot less than paying for even a relatively cheap, but less capable CCD camera, e.g. Atik 314L+ (1.4MPix, $1850).
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