Does anyone know when this SIRIUS radio is supposed to start? I know that XM started in late Sept. but what about sirius. Do the people out there with the Z919's have satalite radio like the Z828? And when it does start up, how do you order it and haw is it turned on. Is it like a cell phone or pager, turned on by a signal? I am totally confused by this. Will we need any extra parts since our radio already has the 3 band reciever(AM/FM/SAT). If anyone knows how this works please help!