Here is a link that I was provided when I was looking for new brake pads and rotors: BigBrakeParts - Your Source For Performance Brake Pads, Rotors, Stainless Lines and Fluid
I have the R4S pads and they are great. No complaints. Also, paid a lot less compared to OEM.
Did you update your rotors, or did you put them on with the stock rotors. Can the stock rotors even be machined?