A good friend of mine has a 560sl that I have done a lot of work on to get it back to the way it should be. Well yesterday the OEM Becker's cassette quit working (he made the fatal mistake of trying to use it for the first time since he bought it). I could see dry-rotted pieces of plastic laying in the bottom of the unit looking through the cassette door. He wants to upgrade to a CD player with an aux input for a MP3 player which is no big deal until you start looking for a unit that doesn't look like a Winamp skin or video game. So my question is: can anyone recommend a head unit that fits the style of a Merceds-Benz? One that has a simple layout and actual knobs like the units of the late 80's and early 90's before everything become menu controlled. I am considering trying to find him a vintage unit, but then we will be back to the problems associated with old transports and electronics. I remember there were similar threads like this in the past, but haven't seen any on a search, plus new models come out all of the time to replace previously recommended units. He will also upgrade the speakers and maybe add some rear ones as well, so it has to have at least one set of preamp outputs. Thank you in advance, John.