Good choice! 4runners are a lot more $ than an XJ, but they hold their value extremely well. Even when you go to sell one with over 200k, you can always get $3500+ out of them. They're very similar to a tacoma: same motors, drivetrain, t-cases, and font suspension.
You're looking for a 96 and up. You DO NOT want the 4runner with the 3.0 V6 (1989-1995).
The 3.4L V6 is a very reliable motor, as is the 4 cyl 2.7 L. The v6 will have a bit more power, the 4 cyl will get a bit better mileage. Neither one is a powerhouse or amazing for towing over 1500 lbs.
If I were to get one another one (I've had 3), I'd look for the following:
'96-02 4runner
clean title
200k miles or less (but well maintained)
auto tranny
I'd look for one that had the rear elocker, but I would personally avoid the limited model (leather, etc, different HVAC controls which had issues)
check to make sure the following has been done: timing belt, water pump, front lower ball joints, and transmission drain and refill every 90k or so.
The "sport" or "highlander" editions came with a hood scoop and the elocker. however, people think they're made of gold if they have the hood scoop. You'll easily pay $1000 more for one with a hood scoop. To me there's no way it's worth paying extra just for an extra bulge on your hood, but some people will do crazy things for the exact model they want.
4runners don't get great gas mileage, and they don't tow big heavy loads. However, they are extremely capable and dead reliable. There is a large aftermarket for them and the online support is awesome. Toyotas aren't for everyone, but with how dead reliable they are, they're really tough to beat.
Going UP! on here has a 4runner with over 360k on the original motor and tranny, still going strong on 37's. My tacoma has 230k and aside from plugs and wires (regular maint) it hasn't needed a thing, and I wouldn't hesitate to drive it across the world.