Sherwood put together a lot of wheel weight data
here
FWIW the Ruf Speed lines did get a bad rep on track a few years ago, don't really know how deserved it was, I have also seen cracked Fikse and Kinesis and Fuchs wheels. I have Speedlines on my 993 for street(they are also at the heavy end of the scale)
Please don't ever use the cast after markets on track though.