It looks like you're out of luck. The deck has alot of nice features but from what I saw it doesn't support SIRIUS, but I read this article and it mentioned something about added support for a sirius tuner or something... "http://www.pioneerelectronics.com/pna/press/release/detail/0,,2076_4313_191756404,00.html"
Edit: I don't know what is needed when you get a tuner, to hook it up to your deck, do you get the tuner from pioneer, or are there tuners that fit any deck? Because that maybe just pioneer manufactured tuners, I'm going to check a few more things out...