The dust on the HPS's won't be as bad a Axxis Ultimates from what I've read...it isn't that bad. I'd also be surprised if they eat rotors assuming proper break in. You only need new rotors if there's something wrong with the existing ones.
Lots of good articles on this subject by Stoptech:
http://www.stoptech.com/tech_info/te...e_papers.shtml