I've seen brando/china vision's cassette mp3 player... a cassette sized device that pops into your dash cassette player... but why is there no display, telling you what you're playing, etc? Does anyone make something a little more elaborate? We have a minivan with the whole cassette, am/fm/cd/ dvd player suite. I don't want to mess with changing anything around. Something I could put into the cassette player that would play MP3s would be great. Like the old cassette adapters you could put in 8 track players.