welcome to the 4dr crowd... and the Rubicon. I love mine... even with the 6spd, you will probably notice the extra weight of the 4dr. it still holds its own.
wheeling is different. i finally got to really take mine offroading on June 28th. i got highcentered twice with my 2" b/b. it was in the river bed sand, so all i had to do was back down. no biggie. i will say this... once you put a 2" b/b on the 4dr, it looks about right. you may be able to get by, but the 2" adds just the right amount of air over the Rubi's 32" tires.
I wish i had stopped and taken a pic when I was hungup... but this was me on the way out.