Well, you could pick something more unique, but not MUCH more. With CoSport's sold off and disappeared, Steve no longer 'wheeling his and DC getting rid of his in CA there are only a hand full left set up for off road. I haven't seen one on the trail here in Colorado in 5-6 years; I've never seen on in Moab.
The Sport is a full frame as mentioned above. That said, don't expect it to drive like a car. They're also not 'powerhouses' so if you're expecting to tow a 5000 lb. trailer you'll be disappointed.
I'm shopping for a second one to start building next year and I highly recommend the 3.5L. Especially if you're planning on going with 33"+ tires. If you decide on a 3.0L you'll be happier with 33"s and installing 4.88 axle gears (in a 5-speed) or 4.64s (in an auto; your torque converter and tranny will be happier with you, too).
The 5-speed was only made from '97-99 and was only available with the 3.0L. <img src="/forums/images/graemlins/frown.gif" alt="" /> Good transmission. If at some point a clutch becomes necessary - upgrade it. If you add a lot of extra weight and take it off road a heavier clutch will last longer and pay for itself. Something to be aware of: a significant number of 5-speed vehicle specific parts are no longer manufactured and no aftermarket manufacture has picked up production. That includes the torque roll stop assembly (transfer case), transmission mount and transmission to transfer case adapter.
Personally, I recommend the '98s on up. There are a few idiosyncrasies in '97. In mid-'97 they swapped ECUs. Cruise control behaves better on the '98 on up models.
If you decide on a Sport make sure it's loaded with every option known to man and everything works. Factory locker, gauges, rear tire carrier, etc. It'll save you money in the long run. Parts are not as cheap as on your Frontier and there are virtually no after market suppliers dealing with the Sport. So, anything you can get already installed will be something you don't have to buy and pay to have put on. I also recommend considering one with leather if you're going to drive it a lot and plan on owning it for quite a while. The factory leather was very good quality; it'll take a lot of abuse and is easy to keep clean.
I found a '99 here in Denver last month for $4500 loaded to the hilt; all you'd need to make it trail ready was a skid plate for the front, rocks skids, manual hubs, a set of rear leaf springs and a set of M/T 33"s. Disconnect the sway bars and it'll keep up with any Jeep similarly equipped.
TYPICALLY the Montero Sport can fit 33"s relatively easily. For the '97-'99s the best solution is to replace the rear leaf springs with custom springs; you can do the removal/installation with basic hand tools. This is more expensive up front but the springs will last longer. Less than $500. You can have the factory springs re-arched for about half the money but they also won't last as long if you're doing a lot of 'wheeling. Usually around $125-250. The cheap, cheesy solution is to use longer shackles and/or 'add-a-leaf's. It'll ride like crap, you'll drag the butt end everywhere and eventually you'll break something. But, it'll probably last for a year or two. Your millage may very. Somewhere in the $25-$150 range. For the '00+ Sports you'll need to replace the rear coils. I haven't done a '00+ so I'm not sure if JUST adding coil spacers will give you enough lift. Not that I'd try that in the first place - custom coil springs aren't that expensive and when built right they're worth their weight in gold. Whichever way, you need about 3". All that needs to be done in the front is tightening up the torsion bars and trimming the front bumper to clear the tires.
Durability wise, expect the same as the Montero/Pajero. I just tipped over 465,000 on my '97 with the original engine and this vehicle gets the crud kicked out of it on a regular basis.
Suppliers:
ARB - front/rear air lockers, bull bar (97-99 only)
Iron Man - suspension lifts
Alcan - custom leaf springs
Rancho - adjustable shocks
OME - shocks, springs
Mark's 4wd Adapters
Marks 4wd Adapters - crawler transfer case gears
All-Pro Off Road - rock skids (personal favorite)
Here is some more info on Sports.
4x4 Extreme SportsEdward