Location is going to really impact the answer to this question. Here in Indiana, the wealthier school district high school parking lots are filled with Beemers, Mercedes, Audis, and Land Rovers, but you're also going to find the jacked-up pick-up trucks on chrome rims, Jeep Wranglers to go off-roading and mudding, and big-ol Duelies to haul horses and boats.
The type of character also comes into play. A princess who rides in equestrian competitions might be proud to own a Ram, while a cheerleader who does pageants might want a little classic Mustang convertible to ride around in parades. A hunter might want a Jeep or some other 4x4 to get around the woods.
Figure out your character, and you'll figure out the car.