Another latecomer. Congratulations on your new purchase! The STi will love you for it.
As to cutting springs to lower the car: each coil on a coil spring is there for a reason, and they are not all there for the same reason. Cutting a coil spring invariably compromises function. If you have no other alternative in order to lower the car, I'd at least have a spare set on hand in case the result is unpleasant.