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Ummm, are you getting XM and Sirrius mixed up? They are two separate companies. They are both satellite radio providers, but there are differences. From what I have heard XM has better audio quality and a slight edge in available signal. XM is a couple of dollars cheaper per month. I do not have either, I'm not sure if I would use it enough to justify the cost... If/when I do get satellite radio I will definitely go with XM. For what I want and from what I have heard they are the better company.
As for the audio input, I am not sure. There are a lot of options out there so I would do some looking around.
One last thing so far the manufacturers are sirrius or XM only. Once you decide which service you want, it will limit what decks you can buy.
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