I have a 3.0 X5 and did not wnat to get ripped off to the tune of $900+ for the CD changer. Any Aftermarket options out there? I got stuck with the cassette in-dash (might as well be an 8 track!)and would love to switch it for the single CD but no go according to dealer must use CD changer in back. DSP system seems to rule out many current CD changers...Help!!!