wondering if anyone here has one or has experience with XM Radio? I'm thinking about getting it in my car. How much does it cost? Is it worth it? I only really want it for the Metal station, which is something local radio around here doesn't and will never have. I have a CD Player in my car but sometimes I like to hear a good mix of songs instead of the same few bands over and over for the whole trip. If I'm driving down the highway in the middle of a huge thunderstorm, will the radio work? Will I be able to get local stations if I want to just like a normal radio? At Best Buy today they had a Sony one for $250, that looked cool, had XM, CD, MP3, etc, and the guy said it's $70 for the antenna. is that antenna built into the car somehow or is it just some kind of strong magnet that sticks to your roof? I work in the middle of the city and I'd hate for someone to steal it off my car... So, anyone know if it's worth getting?