my final bell hasn't rung yet on making final desisions on my new 06 mcs.i have about 8 more days till prodution starts. i would like to know if a new alpine model stereo ( the ones will full ipod and sirius radio compatibility) ie 9855 or 9853 will work with the facory navigation system. or should i just bite the finacial bullet and get the ivad310 alpine all in one and not order the factory navigation.