The year is solid. Rust is a big thing, depending on where you're at. Price will be your next concern since it's at a dealers. The '98 came with 2 different rear ends, a Chryco 8.25 and a Dana 35...the 8.25 is preferable, especially if you plan on building it. Other then that, if it's an auto, the AW4 is pretty much bullet proof and if it has the 4.0, that is low milage if it's been cared for.
'98 Cherokee Ltd, I6 3.5" RE w/ full leafs, 33x12.5x15 on 15x8 AR, SYE
'91 Cherokee Laredo, Stock