Nice topic.. the ONLy place to get the latest and updated prices of audio components.. 
I have a Kenwood cassette player with some very low range kenwood speakers in my cultus VXL 2003 model; I need an upgrade on the audio system.. i will go in steps as I cannot afford all in one GO!!
I dont want a real heavy pro typa beastyy system I just need a quality system with quality sound and bass with USB support.... but not to forget that my budget is very low and I dont wanna go for an upgrade on the battery as well.. but do guide me if a battery upgrade is necessary too....