I assume you are regearing to 4.56's right?

I dont think you really need control arm skids unless you plan on bashnig hard out at liek Moab and the rear panel gaurds are for just comestic pleasure. The TCase and Gas are very nice and will do their job. Also you will need sliders but look into one where they protrude out from the XJ to stop trees from hitting on a inclined hill.

The bumpers hmmmm, well I built both of my for about 150 total and thats buying the metal per foot not 20" lengths. So you know any friends? Also JFiscus now has a company called MadHorse Offroad and they only make XJ stuff and have a nice looking front bumper for less than half of that TnT, you plan on rolling the Xj to have a chance to use the Stinger. The JRC rear isnt a bad choice and the Tie-ins are very nice. And with the added weight some spacers up front might be needed along with maybe a schakle out back.

THe APN header is good choice but do as Lazarus(Josh) and hit it with some high temp paint so it cools more uniformly. The snorkel to me is just for fun and it looks cool. If you plan on testing how far you can go with the stock airbox then get the Airflow.

And all that mumbo jumbo brings me to, Do want you want to do. Don't get something else that looks like what you really want because you will just be wasting you time and money. So if you want the TnT fork out the cash only once and be happy.