You might wait for Sirius radio, go to their website, they have a lot more talk stations, and over all, I think they have a better satilite service. I don't beleive they have actually launched yet however. They do brodcast the stations on their website right now though.
Sirius, as I understand it, does not have any commercials at all, but costs a couple more dollars per month. They also have more support from car manufacturers.