The blue stamped B8s are the very earliest versions of these Sabians. B-8 is the alloy mix, 8% copper, 92% tin, where as a B-20 is 20%copper. NS-12 is Nickel-Silver and tin (the Dixie, as it is a Paiste stencil) among other metals, undoubtedly containing some copper, although you'd be hard pressed to get the exact amount I'm sure, it's worth about 50ish, I have an 18" Ludwig Standard, the same cymbal, really, and I like it, goes well with my MIJ kit.
The Pearl hats are maybe worth 20-30 bucks....the B-8 Plus early 80s I think, if you keep the set together, maybe 60ish? They are not all that rare, but you don't see them much anymore, either. I had an 18" China that was a little warped, but got some really trashy sounds out of it and wobbled like a top.