New 2012 Prius 3 Owner - comments/questions concerning audio system.

Just purchased a new black Prius 3 in Thousand Oaks. Love almost every aspect of the car except for 1 major pet peeve. Stereo system sounds like my 1965 Westinghouse transistor radio. Worst sound I've heard in a car in ages. Sound has no stereo seperation and no depth and no punch. I asked the dealership if I can buy their upgraded JBL system and was told that it is not even an option to upgrade in the Prius 3. Would like to hear some of your opinions and suggestions.