[s-cars] Aftermarket Brake Options

[Cody Payne]

Gents,
        Wanted to see if anyone is running any other "cheaper" braking options to the Big Reds?  I see on UrS4.com they list two other Porsche options of:

System 1
Uses Porsche Boxster 4-piston monobloc caliper over the 1999 Audi A8 312x25mm rotor. Fits under 16" wheels.
System 3
Uses the Porsche 996 Carrera 4-piston monobloc caliper over the European A8 314x30mm rotor. Fits under 16" wheels.
Anyone know of the cost of these two options?  And is the System 1 suffcient braking for a 300HP rarely tracked car?
Thanks
cp