Dane, I also asked Joe about weights of those wheels a few minutes ago on bfc. Post up here if you get an answer and I'll do the same.
http://forums.bimmerforums.com/forum...php?p=21271160



Also, consider the Apex ARC8's which are also nice and light (under 20 pounds each, weight varies by size)
http://store.vacmotorsports.com/apex-wheels-c366.aspx