Lafirin, the B8, AA, and AAX are all Sabien cymbals. The B8 it a cheaper, entry level cymbal. Zildjian also offers different grade cymbals, with the ZBT being their entry level cymbals. They also offer ZHT's, and ZXT's, before you get into their better cymbals. I won't try to compare the Zildjian ZBT, ZHT, or ZXT with the Sabien B8, only because then we open up a whole debate about whether Sabiens, or Zildjians, or even Wuhans are the best cymbals.
As I recall another post (I think it was yours), you are trying to stay away from the entry level and purchase cymbals that you can be happy with for quite a while, so this should help you, at the very least.
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