Why not spend a little more and get an adjustable dampened coilover with the spring rate of your choice?
Your still going to need a custom shorter shock that more than likely will not have adjustable dampening to go with that spring..
Factor in the price for those custom springs, then add the cost of custom shocks then call Luis @ Paradise Racing and see what kind of specials he's runnin. (humor me)
Your really not that far off from having QA1 coilovers.
Just sayin.. It's a night and day difference.