What sort of braking are you doing? fast road, drifting or out and out track driving.

For all out track driving you will need something larger in terms of disk size for any sort of longevity.

If its fast road or drifting then r32 gtr or r33 gtst(gts-t's disks are 30mm thick and gtr's are 32-only difference) will be more then adequate with decent pads and braided lines.