SSRs are definitely a light wheel. I've held an SP1 before and compared to the work meister s1s I used to have, these the ssr was so much lighter. But if you're looking to go leightweight, the type F is the way to go. they have the weights listed
here
I actually have a friend that has some Flat black Type F's in 18x9.5/10.5 with some pretty aggressive offsets for sale with tires. I know the rears are +15, I think the fronts are +22, not sure though. I can check what the exact price and offsets are if you want. They came off his show car rx7 so they're in great shape. He's running different wheels now. I'd buy them if I had the cash lying around. He lives in the torrance area so if you're really interested I'm sure I can set up a test fit