Will this be your only car? A RWD sportscar probably won't be the best thing in the world during a Colorado winter.
If you NEED 4 seats, you can't get a Z. That sounds like the first thing you need to decide. How often do you actually haul 2+ people around? If you don't and are just looking to keep that option, then go with the Z so you match what your reality is right now.
