Personally these worked well for me.
eBay Motors: Chevy Impala 97 98 99 00 01 02 03 04 05 D/S Rotors+Pads (item 280235677473 end time Jun-21-08 18:47:32 PDT)
When I got them from BrakeLabs, they were actually R1 Concept Rotors. And the Posiquiet pads are unbelievable.
As for "DEEP" Zinc plating, that is no such thing. There is Zinc plating, or no Zinc plating. And mine so far have stayed pretty much shiney except where the pad contacts the Rotor. But that is to be expected.
Just my thoughts on that.