I had the original Crossfire car cover from Chrysler, but it did not last very long as it was just a canvas material and meant more for use inside your garage. I subsequently purchased one by Covercraft and I love it. It fits like a glove, is highly water resistant and blocks all UV rays:
Covercraft Direct Custom Covers. They do have separate covers for the coupe vs. roadster so be sure to check the product description. You may find them elsewhere at Summit Racing, but I believe the price is the same. I'm sure there are other brands available and if it is garage kept you would not need water repellency or UV protection.