Looks like you're off to a great start! I'd look into Armor underneath. If you haven't added anything, the oil pan is completely exposed. A Tummy Tuck is a little pricey because of the need to eliminate the Slip Yoke, replacing the drive shaft, replacing the motor mounts, & lifting the body, but I was able to gain 3 1/2 inches under the jeep and making the jeep completely protected and flat underneath. It allows you to slide over boulders that would normally be damaging expensive components. I want to say my total spend for the tummy tuck was about $900.
Some quick disconnects are a really cheap upgrade that really improve offroad capability if you're not ready to drop $400 on antirock swaybar. but with a 4" lift and disconnects, you need to also replace the front brake lines with longer ones.
I ran an ausi locker up front for a while, it made a difference offroad, but not nearly the difference of having a locker in the rear. Definitely would not do ausi in the rear though, the noise will drive you crazy after a while. I ended up putting an eaton e-locker in the rear, and liked it so much I replaced the ausi up front with the eaton. I ran 33's on the original 3.73 gears, but when I went to 35's, it was just too gutless. People will tell you your crazy for running 35's on a Dana 30/35 combo, but I've been doing it for years running some really tough trails without problems. I just don't let myself bounce, if I can't make it locked, I back up and try another approach.
I'd also consider armor under the gas tank. The stock is way to thin and if you come down off a ledge and smack your fuel pump or puncture the tank, it can wreck your day. Not that it will explode, you'll just be dead in your tracks.
