Although I don't think this is a very good investment strategy, out of the 3 I'd say Viper.
Like others have said it's hard to guess what modern cars will be profitable in the future.
I don't think anyone back in the '60s and '70s thought their cars would be profitable some day. They just liked the car and wanted it; so they got it. I say Viper because they were low production and I think they're neat cars. They're probably a lot funner, too.
I screwed around on ebay and fount this, too. You might wanna jump on it if you already have the funds.
http://www.ebay.com/itm/Dodge-Viper-...US_Cars_Trucks