Shadorne, Yes, the Prius has a "green" (environmentally friendly) sound system - no speaker drivers to contribute to noise pollution. ;)
I'm with you on the shorter commute; likely a strong reason I don't care as much about the sound quality. I must say, however, the Camry has a quieter cabin and quieter engine than the Nissan Altima - something I am immensely enjoying. The lower level of noise makes the car feel upscale and listening to music more enjoyable. I can certainly see how someone needing to spend hours per day in a car would consider a primo system. I must be mellowing with age, as I am quite happy to trade off the extra horsepower (Altima 2.5S at 175 Hp, Camry LE at 158 Hp) for the serenity of the driving experience.
In addition, the listening "envelope" for the driver in the Camry is quite global; no major "gaps" where one can detect a dead zone. On the other hand, at least with the 2.5S I just sold there were distinct "hot spots" or holes in the sound canopy and one could tell easily where one driver left off and another began. Not so easy to tell with the Camry. I guess this IS turning into a review!
To all car manufacturers and custom shops: I am available for extended in situ reviews of your fine automobile's sound systems. :)