What Eddie said. I was in your shoes and asked the exact same question a few months ago. I got a CB and recovery gear first, heavy duty floor mats (not a mod but worth the money), and armor. The following is not an advertisement, just an explanation. I got the Rock Hard oil/transmission skid plate, evap canister skid, and their transfer case skid. While the latter two come with skids from the factory, a side by side comparison will show the difference and why people upgrade. They also make a gas tank skid to round out the system, but I haven't gotten them yet. I'm pretty sure EVO and other companies make armor systems, too, so shop around. Knowing your underside is protected makes a lot of difference on a trail. You already have Rubi-rails, but you could go with a more aggressive rock slider, too. If you are worried about the warranty, go with a bolt on system (x2 on checking with your dealership first to see how they treat mods). Don't forget a good front bumper for your future winch. Do your lift right, and you'll only have to do it once. There are a lot of "right" answers to your question. The wrong answer is to not enjoy your new Jeep, so have fun!