Kid, CDs require a laser with a wavelength of about 780nm to be read accurately, while DVDs(as well as DVD-As and SACDs)require one of about 650nm. However, for years CD/DVD players have used dual 780/650nm lasers which are optimal for reading each type if disc. A separate CD player has no advantage in sound quality.
As SutterCane brought to our attention about a week ago, the new Onkyo DV-CP802 just out is a universal 6-disc changer. It lists at $500 and will be available at lower prices through the usual sources. That's one possibility, but I agree with Dr. Mark that a megachanger, such as those available from Sony, is substantially greater in convenience and is something that you should seriously consider(there is yet no universal megachanger).
