I've just added a post to the Textual Production Group enquiring about the colour laser printers book artists are using. Please reply if you can contribute to discussion.
I have been using an HP Color Laser Jet CP3505dn for the past couple of years and made several books using it. I find that the kind of paper I use is a significant factor in the quality of the book, and that is probably the most important variable in the whole process. Let me know if there's anything in particular you want to hear more about.