Does anyone out ther have an opinion on the sound quality of the JBL 9-speaker system in the 2007 Packages #3-#6 vs. the cheaper Pkg. #2 with a different 6-speaker system? I've read the JBL in the 2004 Prius had poor sound quality, and I'm just wondering if it might be better to go for the Pkg. #2 and add an after-market stereo (if that's even possible in a Prius?) or amplifier. Thanks for any advice!

Prius owner wannabe