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I would follow what others have said... Mount mount mount.. I'd be upgrading your mount to something capable of giving you 5~10 minute exposures... Your Nikon D80 might have high noise, but thats why we take dark frames... Some CCD cameras dont require dark frames, however the firm majority still do... and taking short exposures with a CCD is still going to result in noisy images, as your signal to noise ratio increases with exposure time..
Your best bet is to start taking longer exposures with a better mount and your current DSLR/scope.. and in conjunction with the longer exposures, start calibrating your images with dark frames, flat frames and bias frames. This will result in your images having stronger signal, more data (brighter, more detail), less noise and, with the extra information provided by longer exposures, you'll find the the images are easier to process as well...
Alex
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