If youre planning on going with a GC/Koni setup, you should really look into just spending the extra dime and going with a true coilover setup where the damper has been specifically designed to work with the springs and vice versa.

Konis are great shocks, but pricey. $500 + $329 and youre knockin on Tein SS' door.

If youre looking to adjust your ride, go with KYB/Koni/Illuminas. If not, Tokico Blues, KYB GR-2's, or Koni reds will serve your purpose just fine. Ive been running the blues for a long time, and Id say theyre pretty stiff, but do lack the adjustability if thats what youre looking for.