Well I finally got around to installing my music keg. Since I have the factory NAV, and there seems to be no fully integrated solution just yet, I decided to go with a wired FM modulator from Kenwood. After alot of contemplation about where to mount the display for the modulator, I decided to try a location that I hadn't seen anyone try yet, and see how it works out. The install went very smoothly thanks to the great walkthroughs on this site. Here are some pics of the install.