Is this a one-time project, or something you will expect to be doing on a regular basis?
If it's a one-time project, you will probably get the best quality and color accuracy by sending these scans out to your local service bureau. To ensure the highest quality, they will need to know what type of paper/ink/press will be used for the print run. So the bureau you select will ideally be the same company that will be assisting with the actual publishing of the book.
Good luck.
Epson V700
or the V750 if you need drum scanner quality for photo negative.