I believe a tuner would give you better sound, provided you have decnt stations to pick up.
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?