In the "new to XJs" vein, a couple of things you should look into and consider if they are right for you: Frame plating and WJ brake conversion.
Frame plating is for long term insurance. The XJ doesn't really have a frame, so once you starting increasing tire size, adding lockers and going over obstacles it starts to take a toll on the unibody. The area in the front around the steering gear box is the most likely to have issues, but the mid section also has a lot to do with overall chassis strength. There are a bunch of options out there at different price points, some wrapping around the frame more than others. And while you are looking into frame plating, take the time to look at options for upgrading your track bar mount. The track bar is the most likely cause of death wobble. Switching to a double shear mount is a good idea. Welding that mount in along with your front stiffeners might make sense for you.
And while you are thinking upgrading that track bar mount, and upgrading brakes, look into the WJ brake conversion. That will get you dual piston calipers on larger rotors as well as over the knuckle steering linkage and better geometry. Since you are planning on going to 16" wheels for big brakes you are already past the first hurdle that many folks get hung up on. There are a bunch of different ways to do the WJ upgrade, ranging from buying a complete kit from SFR to piecing it all together from a mix of junkyard and aftermarket components.
Those are the two deep rabbit holes I would recommend you research as you make plans.
A few shallower holes, but also worth being aware, particularly since if your stable doesn't already include a 4.0L H.O. engine, are CPS, motor mounts and radiator.
At some point you will probably need to replace the CPS. These have a tendency to fail without warning, and to fail in such a fashion that you are stranded wherever it failed. Carry a spare. And if you want to make life easier on yourself when it fails, take out the one that is in there now and slot the bolt holes, and also slot the bolt holes on the new one. This will save you from having to remove the bolts all the way in the future. This in turn saves you the fun of trying to retrieve the special bolt after you drop it into the bell housing. Don't laugh. This happens. Note that it takes about 36" worth of extensions and couple of universals (or a universal and a wobble extension) to do this job. You will want an 11mm 6 point socket (at least that is what my '96 requires).
Motor (and trans) mounts are another item to watch out for. Even with low miles, the years probably haven't done the rubber any good. When the motor mounts give up the ghost they will allow the engine to move forward and get friendly with the radiator. This doesn't work out well for the radiator. Additionally, the factory block brackets are known to be relatively weak, and they have a tendency to damage the bosses on the block itself when they fail. There are aftermarket motor mounts and block plates which will resolve this issue. Look into Brown Dog and SFR for those.
Radiator/cooling system is another item to pay attention to. Some folks have trouble keeping temps down on the trail, and sometimes even on the freeway. A good radiator is critical. Mopar made an HD radiator, but I hear those are now obsolete and hard to come by. There are good aftermarket options however. This thread is worth your time:
https://www.naxja.org/forum/showthread.php?t=1150722
Lastly, educate yourself about the 0331 head. There are issues with '00 and '01 Jeeps and that head. It is prone to cracking. There is a head with a TUPY designation that solves the problem. Figure out if you have the 0331 and be prepared to deal with it when the time comes.
Hopefully you already know some (if not all) of the above. But those are the issues which come to my mind for someone who is new to XJs.
Welcome aboard.