Welcome aboard! Nice choice of cars. You must have good taste.
Like CrossfireLTD said, there's not too many off the shelf mods for the non-SRT models. I know your JUST bought your Crossfire, but if you're interested in performance, you can get a GREAT deal on an SRT these days. And for the money spent, you'd get a LOT more performance than if you tried to supe up your base model, and save yourself a lot of trouble.
As far as non-performance parts go, you can get chrome trim for the wind shield, door handles, door mirrors, and side strakes. You can also score a rear defuser to give your rear fascia a make-over. Of course, I don't need to mention new rims. That's about all I've seen that is right off the shelf.
Check out
www.tvtdesign .com for some of that stuff I mentioned.