Rich, what Nato said is VERY true.
I run Ferodo DS2500 pads & Elf HTX115 Dot4 Mineral fluid, and I have NEVER had an issue with losing my brakes - esp. at Phillip Island & in Tasse. And I push my brakes to the limit...
The simplest upgrade if you really do what to go bigger, is the late model Hilux 4spot calliper (use 'My00' WRX pads!) & mildly modded S13 rotor.