New coilover set up

[driving]

My buddy is working with a new company in creating coil overs for F-Body's. The first set will be stock spring rate and all will have full adjustablity. What should be a good price for a set of used stuts springs etc.? Need to send them a set for Spec's and currently daily driving my SS.
Anybody have a set they want to get ride of? :)

[SexOnWheels]

I personally would like to see increased rate springs that do not have a drop to them.

I would really like to run 500-550lbs up front but all the aftermarket springs drop the car over an inch.

It would be something new for the 4th Gens and you buddy's new comapany would own the market.