You can take a look at our full GT-R catalog, with all kinds of upgrades..
As far as brakes, we have done a ton of the AP Racing Slotted or J-Hook rotor upgrades. They last longer than the factory setup, and are less expensive, and outperform. We also have different pad options.
We've done a video outlining some of the differences here:
AP Racing GT-R Rotor Upgrade Video : STILLEN