It depends. What are the number of owners? What's the car fax info? Whats the condition? Garage Kept or not? Any modifications? Has it been tracked? Etc. All questions you'll benefit from knowing the answers too. Also, look on her for common things to look for both in the Crossfire and specifically an SRT6.

If the car is in good shape, generally stock and has decent paperwork on care, then $11500 sounds like of good deal.