Depends on how bad you want it!!!!

Things to consider. Do a search of prices on line for similar mileage / condition SRT6's to get a good range of retail pricing. Also, you'll need to find out and answer other questions as well. Any modifications and what are their value or how might they devalue the car? What color? Condition of Tires? Care FAX and / or servicing records? Location of vehicle (from Florida?, Michigan, etc.). Garaged or not? Driven in snow or not? Any repairs that have been done on the vehilce (this may tell you whether common problem areas have already been addressed.

Things like this all matter but as usual, what matters most is how much are you willting to pay versus how much is he willing to accept.

I'd expect price ranges would be in the 13,000 to 18,000 range, without me looking on the web.