I know you changed your mind, but incase somebody else comes upon this....
The ZJ's arent all THAT bad....just depends on whatcha get on them.
The first couple of years, the V8's were pigs (but they've come a LONG way). Stay away from the quadra-junk (quadra-trac AWD system....once again though, has come a LONG way in the years).
And as Marlon said, the 4.0 will run forever. Period. If you were to find an early enough 1993 model with the 4.0, it might very well have the AW4 automatic ****** behind it, which is the same one thats used in ALL the automatic Cherokee's with the 4.0. (i've seen a few AW4's behind the 1993 4.0 ZJ's)