SVTFern:
What is your question?
The difference between the 2 setups?
Are you talking about stock vs. Koni's/eibachs or Koni's/Eibachs vs. Koni's/H&R's?
As far as I know the Koni's are much stiffer than the stock struts and are able to handle the lowering of the car by the springs. The koni's are adjustable. You can make them stiffer or softer (softer setting is still stiffer than stock). Eibach/H&R springs also tighten up the handling reducing body roll (car leaning thru the turns) and reducing nose dives (hard breaking, cars nose moves downward reducing controlability). The springs also lower the car. This gives the car a more aggressive stance and lowers the center of gravity. The closer the car is to the ground (acceptable lowering not excessive) the better the car will be able to handle fast turns.
The difference between the Eibach's and H&R's is that the H&R's are slightly stiffer than the Eibachs but have less give during normal driving (you gonna feel every bump and pothole). The H&R's lower the car .1" more in front and back and they are stiffer meaning better track handling.
I hope this helps. I chose the Eibachs because I got lots of potholes on my route to work and I gots a wife who likes a comfortable ride.
