I did not realize in my previous post that you already have a rack on your Jeep. Oops.
As far as hauling fuel, have you considered JCR bumpers instead of AEV? Will save you around $500 and I personally think they look better (not that looks really matter of course

) You will lose the water storage though unless you want to sacrifice some fuel storage for water with the rotopax.
http://www.jcroffroad.com/product/JKRTC/JKAC.html
A tailgate table would also be a nice addition if you plan on cooking and don't want to search for a suitable place to set up everything.
Came here to talk about JCR. AEV is awesome and the amount of engineering that they put into their stuff is insane. That being said, they're super expensive.
One option is getting a JCR or similar bumper set (they make a full width bumper with fender protection:
http://www.jcroffroad.com/product/JK/JKVF.html) and getting an exorack from Vector off-road(
http://www.vectoroffroad.com/exo-rack-p-76.html). This would allow you to run 12 gallons of fuel in Rotopax on your rear tire/tire carrier in addition to anything you might want to carry on your rack.
Right there you're saving yourself about a $1000. There's other places to cut down as well; Your fridge for example is $850 from ARB, but TruckFridge resells a 51 liter Indel B fridge for $529.
Indel B is an excellent brand and there are various comparisons that stack the two up against each other. Your lift kit is $1000 on your chart but OME makes a heavy duty for $720ish. Watching craigslist and the for sale sections of forums also helps a bunch, as you can find really good deals from time to time.
One thing I will pimp about AEV is their snorkel (
https://www.quadratec.com/products/17100_011X_PG.htm). It requires cutting a bit of the hood but almost everyone I know that has gotten the JK ARB snorkel has regretted it, it's routed in kind of a weird way and the tube is kind of constricting. The air path of the AEV is a straight shot.
What winch are you getting? If you're going to be out and actually relying on your winch, don't skimp. Stick with the higher level Warns, ComeUp, SuperWinch, and Ramsey...basically anything Western made with a good warranty and good reputation. Synthetic rope might also be worth looking into.
On long trips it's the little things that make the difference, the tray table some people have mentioned is an awesome addition. The ability to have a place to prepare food or hold tools and parts is so convenient, you'll be wondering how you lasted so long without one.
I know none of this is rocket science but it adds up after a bit. And every little bit helps.
Edited to add:
The big thing is going to be space management. I suggest you get the majority of the stuff you need together before you start building a shelving system or look into drawers.