[Big Red Machine]

Anything larger than an 80 minute CD-R that plays in CDPs?  I don't think DVD-Rs are a good alternative for general use at home and in the car.

[Tone Depth]

I've read that some CDP can't handle the 80 minute CDs, they won't play the last bit.  One alternative could be mp3 format on the disc for auto use (if you don't mind the loss in resolution).