I'm trying to give myself a crash course in satellite radio so I can decide between Sirius and XM for Christmas. I haven't listened to the radio locally in months, live in a fairly small city without any music stations I'm interested in. We had a good rock station for a couple of years but it was replaced for some reason by a pop station that is a copy of the rest of our stations. First question I need to know is for the plug and play option..must I have a tape deck? Right now all I have is a cd player, no tape deck..so what are my options? Also trying to decide like I said between Sirius and XM. It sounds like on the little reading I've done here so far, XM has commercials which are a big turnoff for me, and Sirius doesn't, but sounds like XM has better playlists and channels. When it comes to music I'm almost exlusively interested in rock with few exceptions. I'm very interested though in talk radio, the comedy channels sound cool, and especially sports radio. Based on all that can anyone point me towards one or the other?