Best way is to replace the factory head unit with a aftermarket unit......will have all the"options" Bluetooth, sat radio access. USB port(s) for IPods, ect..., internet music services, etc....and will sound a lot better.......
I was surprised how well the Bose speaker systems sounds with the Kenwood unit I installed in my 05. Was pretty easy...hardest part was getting the passenger side air bag cover off...the rest was a breeze. Purchased through Crutchfield and they supplied the correct adapter(s) to interface with the speaker system and the controls on the steering wheel.
Only thing I noticed was purchase the one that has the brightest screen. Some (like the one I bought) is hard to see in the daytime......put out a few more bucks the a bright screen.
good luck