Why would you want to upgrade the stock breaks? They brilliant.
granted the stock ones are going to be good, but they aren't the best
I agree. They don't have a particularly good "feel" at the pedal, and when the car is fully loaded, the standard anchors can feel everso slightly lacking, and in need of improvement.
uprated ones are going to have less fade and be able to stop quicker.
Agreed with less fade, but dont agree with stopping any quicker. You need to "think out of the box" to work out why.

the only think i will say is if you do upgrade the fronts, do the rears too, otherwise you mess up the balance and your passengers will constantly eat dash
Actually, no. There is no need to do the rears. The ABS system has something called EBD, which means "Electronic Brakeforce Distribution".

Oh, and to all the posters/lurkers reading this, Porsche have always had close working relationships with VAG. One of their notable projects was the original Audi RS2 Avant. Indeed, Porsche brakes is quite a popular upgrade.