well for the head unit u can check out nakamichi their units have great detail only play audio cds ,no mp3,usb etc should start around 16k .
my uncle has a nakamichi head unit in his innova along with a pair of dynaudio component front speakers including crossovers,and a pair of 6inch dynaudio rear speakers all powered by a 8channel amp,offcouse all this are worth only if u are an audiophile.