ViperGMC is totally right in that StopTech is the best. One has to weigh the cost as to what you are using the rotor for. For racing they can not be beat. The best street/track pad is the RBC Redstuff as they are made of ceramic and leave very little dust. They are on my website if you need more information. EBC Greenstuf is organic and fine for the street only. I would stay away from EBC Yellowstuf, on the street, which is kevlar, as they will not heat up properly in a street application. They are a race only pad from what EBC tells me.
Hope this helps
Thanks Atro.