I only listen to Sirius in the car. Can I just wire in power to the car unit, and attach a line-out mini-jack to RCA cable, and then attach that to a 12 volt audio amp, which then attaches to the speakers? I don't need a radio/CD etc player at all. And about how long could I run the wire from the Sirius unit to the amp (an advantage over the radios is that I could place the amp elsewhere?

Any recommended units? I have very modest speakers, so just want something reliable.