Even better, some car stereo systems will accept a USB fob, or the output from an MP3 player... I'm planning to install one soon.

If you use 128k sampling rather than 192k, you'll probably get around 10 albums on one MP3 CD (depending on track length, o'course!), and I doubt you'll hear the difference with the engine running! That should get you to Luxembourg on just one disk (approx 12 hours' playing time)!!