Unless there is some item(s) in particular that you are interested in ( for whatever reason... performance or looks) then I would honestly take that $500 and put it away. Throw it in a bank account where you won't touch it and then slowly add to it as you're able).
There are way too many modifications/ upgrades out there and what's right for one guy may not be right for another guy. Hell... I would personally drop the grill inserts right off the bat... different people/ different tastes.
What I would do while that $500 is waiting patiently and drawing some interest, would be to continue driving that Jeep and wheeling it whenever I could. Look at what kinds of things you like and what kinds of things you begin to feel as if you might need to have. Look at other JK's and research those specific products that interest you. Your Jeep is good looking and pretty damned capable as it is right now, so enjoy what it has to offer and learn more about its features and capabilities.
You may be more inclined to start looking into interior/ creature comfort upgrades, or you may find yourself interested more in performance-based upgrades, or you may just like adding some personalizing cosmetic touches... who knows? But there are too many things out there to throw money at so enjoy it as it is until you find yourself extremely interested in whatever particular item/ upgrade. JMO
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