Does that mean I get to use them half the time?
I don't think it's realistic to get wheels weighing less than the rays in 19", nor do I really see the point if you're not tracking the 350z, in which case, you wouldn't be wanting to do it on massively expensive wheels anyways.
Advan rs's or ians ce28n's would be damn close though, as ian said, they're like a couple of lb out from the rays.
It's an interesting question though, so can I have the dymag carbon fibre/forged mag wheels now