I'm 6' and feel comfortable with the top up, even with it being modified to the "low bow" configuration. Kinda snug and cozy with the side curtains in place.
The rear window has a zipper. When its down, and with no side curtains, there's a nice breeze. Making it cooler to drive in the summer than with the top down. This improves rear visibility slightly, and is good for minimizing skin cancer, as well.
Don't get a coupe. There's nothing like the sensation of driving an open car.