our shop goes through autoparts international for aftermarket rotors. I havent used them on the R but Ive used them on plenty of other cars. made in china but definitely good pieces of metal. just make sure to clean them with cum gutter/brake cleaner before you install them to get that crap the chinese put on them before they ship.
If you are looking for normal OEM rotors then whatever chilled man listed will do!
If drilled/slotted , I went with DRT rotors, what they did was take OEM rotors and Drill/slot them out pretty reasonable on the price too.