Beachcruiser said it right. I would make sure that it is mechanically sound, and you know all the right fluid is where it needs to be.
Usually money is best spent on tires especially on a 4wd.
Decide what you plan to use it for mostly, and if it is going to 80% or more street a good all-terrain tire will be much better than a mud tire in a lot of ways. I had a set of 31" Uniroyal Laredo tires on my last YJ for street driving, and they would take me some places that most folks wouldn't believe, and I got better mileage with the all-terrains.
Next decide if you want to lift it and how high before you decide on the size of tire/rims you want.
Even if you plan to leave it stock, I would also look into better bumpers, a winch, and recovery points even if you don't go offroad much. They will be more useful than you may think.
I noticed you have the 2.5 4 cyl.......I wouldn't go with too big of a tire if you do any highway driving. I am non 33's with mine, and it really killed my 50+mph.
Best of luck to ya, and welcome to the madness