As has been said, you definitely have to sit in a variety of vehicles in order to evaluate their rear/side visibility in relation to your height and your neck condition. However, I can save you a bit of time by advising that you not even consider any of the following, due to their abysmal rear/side vision:
Chrysler 300
Dodge Magnum
Dodge Charger
Chevy HHR
Any Hummer
Unless you want to feel like you are sitting in a sewer pipe with a few very small openings in it, you don’t want to drive those cars.