From my understanding, the s2000 would accelerate quicker, and break quicker than the 86, and the 50 / 50 weight distribution would give it a total advantage on the track, both tight turns and wide turns.

Also there is practically no weight difference in the two cars, and i like to think you get more for $70,000.

In saying that, the condition of a second hand s2000 is really unknown so compared to a new 86 you may not have the same refinement or comfort in the s2ks suspension. Unfortunately i did test drive a couple of s2000 that drove like 70's MGs