[rdorman]

It is hard to go wrong with Koni double adjustable. Something to keep in mind is service. Koni is a logical choice for me because I have a local shop that can dyno, revalve, rebuild etc. I can give them the cars specs and use and they will set up the shocks. I know a number of people that have Superformance that have changed out their AVO shocks for I think Bilsteins. Ask around on the Superformance owner forum (sorry, don't know the address). What ever you do, don't just buy a shock because it fits. Obviously it needs to but the shock should be valved for your application. Of course, Superformance has already taken care of that because of the testing they have done and should be able to recommend a good starting point for valving.
Rick