I can sort of se what FRS is saying about std brakes at the Nurburgring.
I went with standards last easter and they held up extremely well with some decent pads, and drilled disc's, but upon returning with some proper ones I can say it did make a difference to the drive.
I could brake alot later before the bends, but the additional weight of the rotor meant I experienced a little more underseer than usual, due to the extra weight of the larger disc.
The power of a car however bears little resemblance to the speed that it slows down at, only the weight.
A 1500kg 500bhp car slows at the same rate as a 1500kg 250bhp car
Brembo do make some cheaper kits than AP, but they also do some £3700 kits for 380mm 8 pots!!!!