I have an XM satellite radio adapter in my car, which has a very good audio system (Mercedes/Bose). Satellite radio has plusses and minuses. For the plusses, the big ones are (i) variety of programming, (ii) lack of interference (multipath, etc.) and (iii) commercial-free channels. On the other hand, anyone who claims that satellite radio is CD quality is smoking something. It's highly compressed low-bit data--perfectly pleasant to listen to for background--sort of like MP3-- but not for serious listening. For sure you should get a good tuner if you have quality stations in your area. For a small additional amount of money, you can now get XM satellite receivers for home use, too (there's a Sony and a Delphi, each of which can be used with home audio), so you can use that for the additional variety.
Tuner vs Satellite Radio
I always intended to add a tuner to my system and the logical choice seems to be one of the Magnum Dynalab models. However, the recent introduction of satellite radio (Sirius and XM) offer an interesting alternative. Digital quality, no commercials, and a wide array of music to choose from. Then of course, there's the other option of adding digital cable with its music stations playing through my system. Can anyone make an argument for choosing one over the other? Which will deliver the best sound quality?