Most any radio is better than the becker radio, and probably cheaper.
I would suggest you look into an aftermarket stereo for the car. pretty much anything by alpine and pioneer are very nice. others prefer other brands.
I would suggest you repost this in the car audio forum to get better responses.
'92 300CE - Sold
2004 C240 - C7 Wheels
2015 ML350 - P1, Pano, Ash poplar wood, Sport Dinamica interior, Running Boards Keyless go.