Hi, I have a 2002 A4 B6 with the Symphony II headunit. I am looking for an OEM unit from a B7 that will play MP3. I was originally looking for an RNS-E, but due to the fact that they are more expensive and I dont really use SatNav I am looking at alternatives. Ideally I am looking for a Symphony II+ but cant seem to find any, I have found a few Concerts though. My question is, what are the differences between the symphony & concert? Im taking it the symphony's are of better quality? Many thanks.