I went with the progress springs and let me just tell you they are the best thing I have done to my car. After the installation the drop was about a 1.6" drop.. Im sure it has settled some since then but I havent been out there to measure it. (Just installed them on Sunday).
The car hugs corners like you would not believe. There is almost no roll. And there is no harsh bouncing, the ride is very controlled and it feels as if the car is stuck to the road.
I bought mine from
www.newedgeperformance.com
they definatly get my vote
oh and ps they have a lifetime warranty- all you have to do is fill in the registry for them and you got a lifetime warranty!