My personal preference is to get free HD digital radio and I hope the radios have this capability.
Best Buy and other car stores are selling them and you can also plug in your USB thumb drive and play your MP3 files as well.
Learn more about HD Radio here and it is
free CD quality sound being played around the country:
http://www.hdradio.com/what_is_hd_digital_radio.php
It was not mentioned here so I assume you have not heard about it so go spread the word.
Just like a lot of people think you can only get HD TV from cable or satellite and that is not true.
If my cable ever goes out, I just switch to my external antenna and get free HD TV and it is awesome.