After reading through a few threads, I think I'm interested in lowering the ride with 350Z springs. If I've read correctly, it'll give me only a 1/2 in drop. True?

And if so, which springs should I be looking for? Browsed my350z and those available are '03 springs, '04 springs, and '03 track model springs. Or should I be looking for others? Ideally I'd like the firmest ride I can get with only a 1/2 inch drop.