18x8 Speedline Turinis come in at 20.4kg with a 225/40 tyre. Sorry,I don't have a weight without a tyre.
Because of the offset/PCD you're pretty much looking at only a few types. OZ, Team Dynamics, BBS, Speedline with the first two being a bit lighter but the latter come with a bit more strength. The TDs are superb value for money.
I'll pop a picture up of my car on them in a mo, they're just uploading.