this topic has come up on numerous occasions. however, unless you must rely on your crossfire as your only transportation, you don't need to spend $400+ for a tire. but you likely will have to wait as you stated. order your tires from tirerack and have them shipped to your home or tire shop unless the tire shop can come close to matching the price. right now the continental all-season tires are only $141 for the rears and $138 for the fronts. the michelin PS2s are $289/196.

instead of relying on the tirefit system (which can eventually clog the tire valves and cause the pressure sensor to malfunction) make sure to keep a vulcanized rubber tire repair kit and a pair of needlenose pliers in your car at all times. i am speaking from experience since i had a flat 600 miles from home. fortunately i was able to have the tire plugged by a roadside assistance garage (not affiliated with Chrysler) after the tirefit didn't seal the rather large hole. now i carry a plug kit and have used it twice (on other cars).

the extended warranty doesn't provide much in such a case because you already have Chrysler roadside assistance while under the bumper to bumper warranty. you can also add towing to your insurance for a nominal amount. if you have other transportation, the rental benefits don't provide much either. but if you will be paying for the new tire you definitely don't want the car being towed to a dealership or tire shop that won't offer a competitive price or allow you to order your own tire.