To answer your question in the other post, I'm running the Bilsteins for lowered springs, I don't have the number handy right now.
Overall the ONLY thing love about the springs is the height. But I only appreciate this when the car is sitting.
When I drive the car, it is too bouncy. I do not believe I can fix this with messing with the bumpstops and keeping the springs.
I've decided to swap them out for the Eibachs. There isn't much difference in price anymore and the feedback I've gotten on them is that they ride nice. Not as low, but I enjoy driving the car as much as I do looking at it, so the springs got to go. Not to mention my front tires are useless now, not too happy about that as they weren't cheap.