<< Also, the top of the line Sony changer only has 92dB Signal to Noise ratio while the Pioneer has 97dB. >> You've GOT to be kidding! I seriously doubt you could hear the difference sitting still with the engine off, much less moving at over 3mph! Remember, as soon as there is music playing (the entire point of it) the *extra* 5db of noise would be masked. I wouldn't let that factoid enter into the decision chain, IMHO.