id just go for some R32 GTR or R33 GTSt calipers and rotors... its only a 16mm bigger rotor or so but theres not much else you can really do without spending big bucks on 33 or 34 GTR brakes.
prefferably go for the 33 gtst brakes as they came out with brembo's. better than the sumitomo things on the 32 GTR.