i really want to get one of the 2 for my car, but not sure witch one. i had a rental about 2 weeks ago that had sirius in it, so i got to play around with that for a few days. had alot of good stations, sound quality was failry good, not cd quality. but the one thing i didnt like was if i was in a tunnel or driving down a road with alot of trees over hanging the radio would cut out. i havnt had a chance to use xm yet, so dont know of many pros and cons of it. so i was kinda hoping some of you guys could help me out.