...........whatever you do dont used Greenstuffpads. Omegas are too heavy.
My first change was to EBC Discs and Redstuff (by HiSpec at Dartford). Garbage, utter garbage.
I currently run Ferodo Fast Road pads with Courtney grooved Discs (front and rear) which I have no complaints about at all.
As has been mentioned already (and in many, many previous threads) OE are more than sufficient. Entirely your choice/preference and of course, budget.
Big, two part discs with six piston callipers (is that the right terminolgy? :-?) can be fitted to the front wheels for about £1k - £1.5k (red dot, Willwood, AP Racing can ,but not unfortunately Tar Ox or Brembo (not Omega specific anyway)) and you've got to have fairly big wheels to get it all behind in the first place.
It's all personal choice I guess!
Good luck and keep us all informed!

Matthew