Hey guys. I'm sorry if any of these have been asked before, I've been trying to do searches but not finding much information (btw, does anyone else notice that if you tell it to search title only, it completely ignores that?).

Anyway, at first I was considering getting the grand touring without nav. I was thinking that I wouldn't really care for nav, but after doing some reading on it I think I might be changing my opinion. Can it really be viewed in a 3d-mode like the brochure?

Second thing, I just wanted to confirm the differences between the touring and grand touring (I have read the 100 thing faq, but wanted to make sure there was no other issues) - Brembo brakes, 19" / 18" wheel combo instead of 18" all around, and the aero package (which I would add on to the touring anyway), so basically I'd just have the difference in wheels and brakes. No change in suspension, or any 'fine tuning' to the engine, etc?

Third, I would like to get either the sirius or xm radio. I know this choice is highly opinionated, but are there any clear-cut advantages one has over the other? Any reason I wouldn't be happy with either choice? I've heard that many of Xm channels are no longer completely commercial free, and sirius is? Also, sirius has the nfl channels that xm doesn't?

Thanks guys, and I apologize if these questions have been asked before!