Sounds like you bought the car for short term investment value; bad move.
Have you ever heard of buying high and selling low; that is exactly what your doing and would apply to any new car that appreciates as soon as you drive it off the lot.

My guess is that the resale value is not the reason you're selling it; if so, bad reason.
Unfortunately, like all transactions of this type, the buyer of your Xfire is going to benefit immensely but don't blame Daimler-Chrysler for this. It could have been GM, FORD or HONDA for that matter.