Andy, go with what lee has said. I think thats the best setup for our cars.
Im not a fan of my b7 brakes, if i had the money i think i would go for the 6 pot porsche calipers and if ml discs can be had for that little then i would be delighted as the rs4 discs are £600+ from the dealers im sure and can be had from a few places for a little less. If you do got b7 then get the phaeton discs as they are half the price of the b7 discs. You will need the b7 bell to make the disc fit as the phaeton's bell is the wrong offset .
Craig, andy has the b6 discs and uses the movit 4 pot calipers.