What I've done in the past with my other bike is buy a very small portable MP3 player like a Sansa Fuze, take some velcro and put one side on the top of the gas tank where you put the fuel in.. on that little piece that flips up. I then put the mp3 player on top of that, sticks very well and easy to controll in front of you.
Or, you could go with a set of Stereo Bluetooth headphone sets for the inside of your helmet like a SENE SMH10 set, unbelievably cool and works great.