[raymo]

I reckon the ED 100 is a great compromise; the extra focal length will allow you to image many galaxies and smaller planetaries, and you can speed it
up later with a focal reducer to f7.65. it also has a 36% larger light grasp than the ED 80, which is good for visual work as well.

I agree with Steve, imaging Newts are great, and cheaper, but if you are stuck on a refractor, I reckon the ED 100 is the best
one within your budget [assuming that you are buying new].
raymo