I have a 1982 300SD and am looking to upgrade the headunit. I want something that has USB (not iPod). I was looking at Blaupunkt, Kenwood and maybe (gag) Alpine. I like the Blaupunkt St. Louis because it has USB, 4096 colors and supposedly you can upload a picture to it as a background but I hear it doesn't work too well.

My question is which unit is the best sounding for this interior? Secondly, I like features but sound is more important. Does anyone know how reliable each unit is? Does anyone have any experience with these units?