One thing you must take into consideration is the cost of maintenance.
I have a 1993 Cherokee (as you already know, Matt), and since it's older I can still work on it myself. Parts are dirt cheap, and easy to find.
While I do not have a Nissan, my gf has an Isuzu Rodeo, and while it's very nice, it is very expensive to fix. Parts are more expensive, and more work muct be done by the shop since everything under the hood is more complicated.
My parents drive a couple of Expeditions. Very, very nice - but you don't even want to know what it costs for maintenance onthose bad boys!
For you at this point, my advice is to stay away from newer, "nicer" SUVs like 4 runners, Land Cruisers, Pathfinders, Explorers, and all the others listed above.
Get an old Jeep, well taken care of, that already has 4WD and some col sh*t on it. You can't go wrong!
Then again, there's that 4WD Tacoma crew cab with the pintle mount that just calls to me...