I'd like to get a 2nd ACD. Right now I have a 20" ACD bought in late Aug 06 with my mac pro, and now that I enjoy using the MP for photo/video editing, I'd like a 2nd display. Should I get another 20" ACD or a 23" ACD? Certainly I would have like to have gotten the 23" ACD to start with, but didn't have the money or the sense to do it right the first time. What are peoples opinions here as I have several thousands of photos and like to use Aperture and iMovie?