Now that the OP has driven a base model JK, he needs to go for a ride in a AEV lifted rig. This is my 3rd JK. 2010 with a Terra 2.5" lift and 35's, 2012 with an AEV 3.5" suspension, and a 13 with 4.5" AEV susp. The JK really does handle better IMHO with the AEV kit on it vs stock. My 2012, I ran their 3.5 w/ 35 BFG AT's. nice ride, did well long distance, and had a GOBI rack for additional cargo room. With the stock 410 gearing it did great on and off road. This 2013, I am running the 4.5" lift w/ 37's. MPG's are very close between the two JK's. AT altitude on my daily stop/ go drive to work and back I am getting 14.7 avg. I get roughly 16 corrected on the hwy under 65mph. I have stock 410 gears too. I honestly don't feel I need to re-gear either. If I do, 488's fit that bill.
The OP also mentioned air bags to support extra weight. Another mod that I don't feel is needed with the AEV lift. It does support the weight of full camping gear, fire wood, etc very well. With Mountain Bikes up top on the GOBI, camping gear, recovery gear/ tools, 2 people, 75lb lab, and firewood on a hitch haul out back, it sat pretty even still. More importantly, the AEV suspension handled that weight on the twisty mountain roads. I can't say that for the stock suspension or the 2010 I had.
Here's what I personally would consider for your build:
AEV 3.5" SC lift
exhaust spacers
AEV bumpers F/R
WARN VR10S winch
Roof Rack
35's on 17x9" wheels w/ 4.5" backspace
With that setup, I think you're good for most trails. If you are going to run the harder trails, you'll need:
EVO Protec skids
front LCA weld on skids
rear weld on shock skids
C Gussets up front (sleeves if you really want to protect that front 44)
Diff Covers/ lube lockers
You've got about $7K in mods if you do your own labor. Another $2K if you're going to pay a shop to do gears. Another $1500 for a GOBI rack if you need a roof rack.
All things to take into consideration on your purchase with intent to build it. I would most surely buy a 2012 or 2013 with 410 gears. Between the base model and Rubicon, there is a bit of a difference in acceleration.
hope that helps some.
BTW- I would keep your current rig too. I have wheeled with both 90's and 100's with 33's to 37's on them. They do very well. I don't feel one is better than the other. They are two different rigs and handle on/ off road in different ways, but both get the job done. That 100 has a bit more interior room for sure!!!!