If you are taller than about 5'10", you may want to opt for a 7. I have a 5, I'm 5'9" tall, and I feel like I need to be back a few inches. It also took me a while to not hit the door hump every time I got out of it. Also, if you need to haul around more than 2 people routinely, you'll need a 7. Having said that, I love my 5.
1990 MJ Sport Truck 2.5 5 speed - Current Project
1998 XJ Sport 4.0 Auto- Gone
1977 CJ5 304 3 speed manual - Gone
1993 Jeep Grand Cherokee 4.0 Auto - Gone
2006 Jeep Wrangler X 4.0 6 speed manual - Gone