I've pretty much narrowed it down to the Ford B or C springs. From what I understand the B springs are progressive while the C's are constant. The springs will go into a daily car that sees 12K plus a year in mileage, mostly on the highway. I am more concerned with how the car handles as opposed to launching at the strip. I live in the Hampton Roads area which has some areas with rough roads. I know the B springs are little softer since they are progressive, but do they sacrifice performance when compared to the C's?