It all depends on your price range. I'd rather pick up a runner with 200k that has been well maintained vs 110k that has been abused. My taco (same drivetrain as a 4runner) has 225k on it, but it's been very well maintained.
The main thing to look on those is tranny fluid refresh every 90k or sooner, timing belt, water pump, spark plug, and wires. Also plan on doing ball joints and possibly steering bushings and a-arm bushings at that point. Apart from that you should be good for another 100k, assuming it's in good shape. Obviously I can't guarantee it'll run that long, but they're stout little motors.
I'd shoot for one with 150-180k that's been well maintained.