[Saintly]

well.. i have an iTrip (fm transmiter) and i think the sound sucks, i have a tape adaptor but once they get hot they start making noise (and you have a cable hanging out the front of the head unit). you can get an adaptor to allow auxilery input to your head unit but you have to have a head unit that alows aux in and you have to but the adaptor and your signal is still only headphone quality. IMHO an adaptor that comes in as a cd changer, as does the above two, is the best way to go if you want good sound.