The ED80 is awesome for astro imaging. I would suggest you save a little bit extra and get it as a package with the new HEQ5 Mount that comes with Skyscan and higher quality worm gears.
As an example of the image quality, I took this with my 300D DSLR and ED80 last year.
Higher res version here:
http://www.dslrfocus.com/M42.jpg
You wont be sorry with that little scope. Its pretty darn nice to look though too
Best Regards
Chris Venter