PedalFaster

Advance Design shocks (http://advance-design.com) are in the same price range, $400 a corner. They look on paper to be closer in concept to high-end shocks than to Koni Yellows (which appear to have less volume than the stock shocks), but I've heard mixed reviews; some people swear by them, while some people revile them. I am not aware of anyone using them in a Stock class autocross S2000.

Mitch Fagundes (6th at Nationals last year; I don't think he's on this board) is using Bilsteins that he had custom valved. I haven't seen adjustable Bilstein conversions (other than the late, somewhat lamented ShockTek), but some argue that the monotube Bilsteins are better shocks than the twin tube Konis.

Steve

PedalFaster

Oh, and for $500 a corner you start getting into single adjustable Penske / Moton / JRZ territory.

Steve