Make sure to pull up the rear carpet and the thick rubber(ish) mat that cover the floor. This mat doesn't breath so if there was a leak the water can pool in grooves on the cargo floor and rust will follow. My DI did not have rust in any of the usual places but the cargo floor is toast, set my build back already.
The 94 and 99 seem to be prefered-the 94's for the 3.9 with the dizzy and the 99 as it was the last of the breed. The 4.0 came with coil packs so trail repairs are a little tougher to do. Search for an SD model and you will avoid the sunroof issue, most of these come with manual seats which is also a plus as the seat switches aren't great.
64 IIa 88
94 Discovery
06 Toyota 4R (DD)
~Matt
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"Not all who wander are lost"~Tolkein