I got an XM Satellite Radio installed in mine, too but I did not want to lose the capability of having my CD player and radio when I wanted to use them. There are some really nice satellite radio sets that can replace the entire system available through a company I used called Sound Advice (but everything they offered is also available through Circuit City and Best Buy). They had some nice face plates that matched the silver in our cars... I thought about it long and hard but prefer having all three options.

This is my set up and it does not interfere with anything other then that little drawer that holds nothing but change that I never used anyway. Antenna is in the dash in the upper right corner to receive the signal and works great!