River Raider has their full skid package on sale now, 10% off. I just ordered one up for my 4-door. This will cover your oil pan, engine, trans, transfer case and gas tank. If you don't go with a complete kit, at least get something to protect your oil pan. Jeeps don't run well with no oil.
Relocate your steering stabilizer before you bend it. Relo brackets run about $50 from a variety of manufacturers, or $100 if you wait too long and bend the shock. If you've decided on what lift you're eventually going to buy, get the relo bracket from that manufacturer to ensure it's compatible with any trackbar bracket you'll need later.
Lower control arm mounts are vulnerable. You can buy a bolt-on kit, but weld-on is better. For around $100 plus a six-pack of beer you can get a local welder to just weld-in scrap 1/4" plate to the front and rear mounts, then bring it home to sand, prime and paint.
Evap Canister needs to be skidded or relocated. Poison Spyder has what I think is the best skid.
Front and rear differentials should have beefier covers. The OEM stamped steel covers are thin.
You don't have rock sliders or rocker protection. I'd suggest getting sliders -- Rubicon take-offs are good and usually cheap -- high your list.
I'm a JKO Reject