tires
AZ,
I think we all 'feel your pain.' In my view the tires are the most unnerving part of the car...they (and the fact there is no spare) are the reason I won't take that car on any road trip.
That said, when it's time to get tires, the car dealer is the last source I'd deal with. They won't have them in stock, may or may not try too hard to get the right tire, and when it does come in you'll pay absolutely top dollar (although in your case they might cut you a break if you go in wild eyed and angry). AND are you SURE they can mount the tire on those wheels? My Chrysler dealer, whom I'm pleased with, sends all tire mounting work to a custom wheel shop nearby.
Had a British sports car a few years ago, needed a set of tires. Had it in the dealer for other service, he pointed out rightly the need for a set of tires. Said he had them in stock...they were Goodyears that were sold primarily in Europe, factory standard on that year make of car. I asked how much. He told me, I winced.
Went home, priced them from Tire Rack. Had them in stock at about half what the auto dealer wanted. But...passed and got a set of Yokohama AVS Intermediates anyway.
Good luck. You truly must be very frustrated. It's a lot of money to spend for that kind of aggravation. It's little consolation to say that if/when you get it straightened out, the Xfire is a great blvd cruiser and a ball to drive.