After a lot of research and deliberation I dug deep and went for a set of Carbotech XP10 pads on the front, after hearing very good reviews from GTR owners (similar power, similar weight). Also fitted a set of the new EBC Bluestuff pads on the rear to complement the fronts. Overall damage was over £500 plus fitting (ouch), but boy what a difference!
Chalk and cheese doesn't even cover it. I never could have imagined that there could be such a complete difference in braking performance with uprated pads - I always assumed that the discs and calipers were the biggest factor. Boy I was wrong. Braking performance is incredible, OEM bite from cold, but once these babies are up to temp the braking is sublime. Nice firm pedal, huge retardation, excellent modulation, with much less pedal effort than before. The harder you brake, the better the pads get, they're simply amazing.
Both sets of pads are rated as track pads, but with the weight and performance of the car, this is really what you need to stop nearly 2 tons of estate at speed. Pads are said to be kind to discs, only slight negative is slight squeaking when cold and more brake dust than normal, but neither are really a problem, the braking makes up for it.
All in all, best mod I ever made. Highly recommended.

Mart.