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weight;
Audi S4 Avus Cast 17x7.5 28.0(same as s3?)
Compomotive MO Cast 18x8 26.4
BBS CH Cast 18x8 24.0
BBS LM Forged/Spun 18x8 21.6
BBS RC Cast (soft) 18x8 19.5
BBS RSII Forged/Forged 18x8.5 24.0
BBS RX Cast 18x8 24.2
BBS RXII Cast/Spun 18x8.5 26.3
OZ Superleggera Cast 18x8 17.6
OZ F1 Cup Cast 18x8 25.3
OZ Superturismo Cast 18x8 26.0
Team Dynamics Motorsport Cast 18x8 24.0
Team Dynamics Visage Forged 18x8 17.4
Sounds like the oz superlegga are the lightest cast.
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You also have to consider strength...or more specifically, design strength vs weight vs the roads you drive on, and at what speed.
A friend of mine broke a Superleggera after hitting a pothole...completely wrecked the wheel.
I bent a front strut on my last Golf GTI after hitting a pothole...I was running 205/40/17 tyres and 7.5" x 17" BBS RXs at the time. The resulting check revealed 0.04mm deflection on the BBS wheel AFTER bending and wrecking a coilover strut!
We have bad roads up here...BBS last if you hit them hard.
Some of the lighter wheels don't.
BBS RX are a VERY strong wheel...
Another example:
This is an Enkai wheel from my old Integra Type-R.
It was featherlight...16lbs for a 7" x 16" wheel...
Not too strong though...as you can see!
I really like the Superleggeras...but I'd be concerned of their lifespan on the roads I drive, at the speeds I drive and with the driving style I have.