Check out the forum for your area:
Mid-Atlantic Region - Nissan 370Z Forum. The amount of drop you want can be chosen by pictures but ride characteristics are best decided in-car.
I have Swifts and to say they are stiffer than stock isn't telling the whole story not to mention it is subjective. These things soak up road imperfections but don't make me feel like I am in a Lincoln. Then when you jam in to a corner they keep the wheels on the ground. My 40th springs (sport?) were stiff and road imperfections made it jumpy. I like these 100x better. And the drop is perfect for me.