I had a S3 with the factory optional V 5 double spokes titanium flat 19". I had ST40 stoptechs I think they were 355mm. The link that you put of the black S3 with the ST60 6 piston brakes is from a different design wheel that perhaps has a more friendly offset.
My personal opinion on neuspeed 6 piston brakes is that they are excel, I personally got on the the phone with Jerry and Gary(own and manager) and these brakes are made as similar in design to the brembos. Jerry told me how they used the "banana" shape to maximize the most surface contact.
You are not the only "stubborn " on here, I also like to keep things simple, I don't like big rotors because of the added weight but there are some exceptions, foe me the stoptechs ST-40 were so good that I would do it all over again because the size was just right and the bite was incredible. The S3 has a strong factory initial bite but the ST-40 are incredible, so powerful. I hate overkilled brakes on cars, I think you are on the right direction with the Neuspeed(6 pistons) on 340mm. I must add that once a year they run a crazy 30% deal, they have like a VW/AUDI meet and they sell their stuff own the spot.
You should be able to consult with Jerry and go over some final details. I recently purchased 2 piece rotors from them for my RS3 and I love it(7lbs lighter each). Good luck with the Neuspeed but don't forget the ST-40s.
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