Can anyone suggest a lowering kit that works good with crossfires? Hopefully something not too pricey. I've never done this before, although im sure i can do the work myself (or with my buddies). I've seen a couple on the big sites around here.

Eibach Pro Spring Kit for Crossfire
Koni Shocks- Front
Koni Shocks- Rear

I really just don't know how the adjustable works. If i need to replace the shocks, or the springs, or if both are required?

Thanks