exljp, there have been a large number of discussion on this subject. Please search the forum, and you will find discussions on CDP, DVD Players, DACS etc.
I don't know what your budget is, but a minimal CDP will cost you around 15K. Look for CDPs from NAD, CA, and Marantz, Since you have a Marantz, it may be best to go for a Marantz CDP.
You can get DVD players for around 5000 but the quality of music output from such layers will not be as good as the CDP. Expensive DVD Players from CA, NAD, Marantz, Denon will give you good music output, but they will cost 15K and above.
Cheers