Koni Shocks
unless you are building an all out drag car and plan to be really competitive.. the single A will be best for ya. Even Sam Strano who drags his car a shitload is using and recommends the single a.
last i checked, Sam was not so much into drag racing as he was auto-x/road racing.
and Koni's (either S/A or D/A) are not the best shocks for drag racing....they're designed to give the car really good handling.
if drag is what you're into, then QA1's are more ideally suited for the application.
but even then it really depends on whether your car will still be daily driven or not....if so, i'd still go with the Koni shocks, as there have been people cutting 1.5-second 60' times on Koni S/A's, and QA1's suck for handling.
OP, what are your plans for the car? just a daily driver? auto-x/road race? drag racing?
