I upgraded mine earlier this year with SD performance groved & dimpled discs, Ferodo DS2500 pads & HEL braided lines.
Front:
Rear:
I also had the existing fluid flushed out and upgraded that too.
Got the parts from SiCo Developments in the UK and it was around $1000 for the lot.
I do take my car to the track from time to time and this upgrade has made a great difference to brake performance at the track. As far as day to day driving, there is not a great deal of difference over the stock system.