John,
Mounted an XM radio for the trip to GA. I had to experiment with several ear phones to find one that worked.
I bought a Sony noise canecling headset $99.00 that comes with an inline amp. works really well. If you want it louder go to Radio Shack and buy an inline amp and spliter you can hook up four head sets to one source and cost $19.99 it is the size of two AA batteries and really does the trick over 60.