I have not driven the hawk hps pads but from everyone I talk to they all say they are very good. My uncle who works for Rouche (sp?) told me that they used hawk pads on their new performance mustang and that they were the best pad they could find.
One otherthing I have heard about the slotted rotors is that you will probably go through pads a little faster.
I think your plan for the rotors and such sounds really good, good luck with it.