I don't think that a Z is meant to look "classy". That's a sedan's domain.
I think stock, the Z is somewhat round and bubble like in some areas (skirts and front). The new Nismo kit, is how the car should have come in any trim.
The Amuse kit makes the Z look more exotic and more aggressive without going over the top. For me the wing is too much, but the Nismo is just right.
By the way there is a Nismo wing for sale right now in the Classifieds section. If you can get it for around $700, that would be a good deal.
PS. After a year and a half of waiting, I finally dropped off my kit at the paint shop, for installation and paint!!!!!!!!!!!!!!