There are RCD-300 that are MP3 version and can read MP3 from CD. I previously had a RCD-500 MP3 and it sounded good with both radio and CD, well, a bit better with CD and MP3. I have the 10 speakers system that you should have too, I hope. It's enough for my needs.
With a RNS-510 with pre-amp off (VCDS coded) the radio sounds better, with a cleaner sound.