3Rd Gen 4Runner or any of the other toyotas.
2nd would be an older Montero or Trooper (a Newer gen Trooper actualy), although the have very little aftermarket support, they are VERY reliable vehicles that are massively under-apreciated in our market. Older troopers have the GM 2.8 V-6 which just might be one of the WORST motors ever produced in the world. The power band is between 3500 and 4100rpms and even then it doesn't have much juice. I LOVED our old trooper but hated the motor so much we got rid of it. the next owner dumped in a GM4.3 and WOW what a truck.
Stay away from the Uni-body Jeeps. I hate to say this, because I love the looks adn utility of the XJ (I've owned several) and they are really capable off-road, BUT... Nothing but headaches and very low build quality. I LOVE the 4.0l and all of it's I-6 goodness, but you CANNOT get even resonable milage out of them and adding goodies and bit's makes that go down. My dad's 98 (the last in a long line of Jeeps owned by he and I: now going to a Tundra) just puked his ECU and aparently the culprit was a bad crankshaft-sensor that shorted the ECU... Never heard of this, but there it was, dead as. 2K later and it's running but now he's lookin for a Tundra. My 93 (the last XJ I owned) ate 3 water-pumps and by the end of it's run, it squeeked and rattled so bad I hated driving it. The solid axle is nice, but my current IFS Toyota rides leagues better. They are also very cramped inside for how big they look outside and puting adults in the back seat is just torture imo. The Toyotas and the Jeeps are not in the same reliability catagory. While there are certainly good, well maintained examples out there and even some that don't experience the issues, they are ingeneral not 300K trucks. even if the motor made it that far, they body's would be shot and the interior would be falling or fallen apart.
The 3rd gen Runner is nice on the inside, the 3.4 is a great motor and the trucks are available as stated with a rear locker. I've really been contemplating puting the 1St Gen into trail-Toy status, SASing it, and getting a 3Rd gen for an Expo-truck/DD. My only 2 issuea are:
1) I don't belive you can get a 3.4 with a manual and the Locker. An R151 manual swap would be great, but I'd hate to hack up a new truck like that.
2) the frame is nothing near the boxed monster that's under my older gen truck. It truly is an amazingly beefy frame and something I marvel at considering the little truck it's under.
that's my .02
Cheers and No Worries
Dave