DO NOT USE XP10 on street tires, you will just hit ice mode and scare yourself. Or EBD can kick in. You might not get it as bad as I do due to your experience, but you will poop in your pants if ice mode or EBD kicks in at the wrong time. See my video here, car pulled to the right on its own
0411 370z WGI Unstable brakes.avi - YouTube
XP8 is rotor friendly, but you will always get a little wear and you have to make sure you bed them in right. As for the noise, there is some. I would be more concerned about the dust as they can pit the wheel within a week. Here is how noisy XP10s are
Carbotech XP10 brakes - YouTube
If I get in a working mood, I will do some testing with the XP8/XP10/stock pads I have to see how they change the braking distance.
Junk those HPS before they destroy your rotors, worst pads ever. The EBCs are crap too. Grassroot Motorsports recently tested bunch of pads, but I believe they are in the $200-$400 range.