The upgrade to the Treo has made a difference in the sound quality, not just the phone but PTunes too, I think. Very glad it was available and I upgraded last night.
Ran by Fryes and they had a car power adapter for the Treo so I picked that up, and spoiled myself a bit. I also got a Siig device that I can plug the Treo in and play PTunes music through the FM radio. It works very well. I'm surprised I figured I would be returning it.