Like coke and pepsi, Windows or Mac, another heated debate is raging- XM or Sirius satellite radio. My wife wants a car that has XM, and already is talking about getting it because she thinks the playlist on Sirius' Broadway is too limited.  Of course, she never would have thought of this if not for my testing the Sirius S50.  I'm sheepishly admitting I'm a Howard Stern fan (for better or for worse- I'm from the NY area) so I like Sirius also for NPR, and Rolling Stones radio.  Fortunately for the rest of the unwashed masses, The Washington Post's Marc Fisher has a great, in-depth guide to picking between the two.  Now debate amongst yourselves :)