Any SRT6 Roadster with less than 60k miles purchased in late 2013 has already increased in value. These are the most rare Crossfires, and Roadsters/Convertibles always end up being first to rise in value (with the exception of the Solstice Coupe for instance). I bought mine in Aug 2013 for $13,500, and you can look at Autotrader and Cars.com and see a) very few available b) if they are more than 100k miles they don't get a premium, BUT if they are 60k miles or less they going for $15,000 - 18,500 now.