To be completely honest, I think the amount of electronics in these cars will also play a role in these cars not being good "investments." The electronics will likely make restoring a 2014 Mustang in 2064 significantly more complicated than restoring a 1966 Mustang today.
That being said OP, I hope you can get everything sorted out so that you can be 100% happy with your new car.
Current: 2014 V6 Mustang Premium, Automatic Transmission, Oxford White, Safety & Security Package.
Previous: 2006 Chevrolet Cobalt LS, bone-stock except for automatic transmission.