Which rotor housings.
 

FD project: New oem or have mine rebuilt at jhbperformance.com with Cermet B?

go with new oem. Other option for refurbishing include Goopy performance, Freelance motorsports, and Turblown engineering. Stay away from JHB and search the forum for feedback. They have a very spotty reputation. Not really related to the coating itself but moreso their lack of customer service, ridiculous turnaround times, and returning people housings that they didnt send in.

new OEM if you can afford it along with everything else.