Yes California is terrible.. That's why I am looking to unload my Shelby any modification are being questioned.The newer models are slowly growing on me. How are the 500's doing on holding/losing value? If yours is falling off in value might make sense to get rid of it while you can but SELL don't trade it in. Why give the dealer more of your money? You'll be taking enough of a hit in buying this one new and eating that initial depreciation.
Of course, living in California maybe you should get it right away. You've probably only got a couple more years of being able to operate a gas powered vehicle there.