Coilover sleeves like Ground Control use linear springrates so the ride suffers more than just a normal set of progressive lowering springs. The H&R (Sports?) are pretty popular; if you want to still use stock shocks it is possible. Comptech springs (= Eibach Pro-kit if I'm not mistaken) are designed to be used with the stock shocks. The only reason I'm not advocating the Pro-Kit is that it makes the rear of the car look lower than the front (even drop all around + smaller rear wheelwell) so a lot of people end up complaining.

Shingo