Eibach springs are your best bet for a one inch drop. I have 18" up front w/a 35's (eibach springs) I only have rubbing on the right front when turning sharp (lock to lock).....your ok w/a 30 series. Just my .02
Instead of springs you could go with Coilovers. Then you can adjust your ride height 0 to 3 inches. There are a few companies that make them for the NSX. I think I'm going to get coilovers when I sell my Neuspeed springs.
Coilovers will certainly give you the greatest flexibility of your ride height, but the good ones aren't cheap. If your planning on spending $2000.00+ on a set then you've got a couple of good sets to choose from. On the other hand, if you plan on spending only in the $500.00 range, do yourself a favor and avoid the cheap coilovers.
I've got 225/40/18 Nittos in front with Eibach springs. I rarely rub, only at parking speeds with the wheel locked.
Installed a set of Ground Controls with great results. I can go wild and drop the height 3" or more. However, it is best to stay reasonable and have the suspension aligned accordingly. After that, any adjustment may throw off your alignment.