Sorry, but the factory Chevy tuner is not compatible with any aftermarket head unit. But before you freak out, Sirius basically gives the tuner away for free when you purchase select new head units. You MIGHT be able to reuse the factory sat antenna using the Maestro Sat1, which would then plug into the aftermarket tuner. If not, the new Sirius tuner comes with one too. The piece you need is the SiriusXM V300. Again, often times free after rebate.
What features do you want and how much were you looking to spend for everything including parts? You have steering wheel controls that you want to work? Labor? Doing it yourself?
I'm looking at something like this, where I can plug right from the xm base to the factory antenna.