I have a 1989 Porsche 928 GT and the kenwood head unit no longer works. I would like to put in a head unit more like the original Blaupunkt. Any advice on models or brands. I am looking at Blaupunkt, Alpine and Nakamichi for under $350 uninstalled. I do not need a lot of bells and whistles, car is not a daily driver. Thanks for any help.