This KMS looks promising.... I will take a closer look at the weekend. I'm jelous about theese porshe brake calipers...
I definately think, that You should upgrade Your front disks and calipers - take a look at
http://www.300mm.de . . .
I'm going to adapt bmw e38 calipers and fit them with A3 Audi rotors. They will be just 284mm big

but I will keep my 15 inches rims - they are the only reasonable for our roads conditions...
My budget will be about 5000 euros - including painting/ welding/ tranny/ brake conversion and all things You can see in my member profile... I'm going low budget rather than all new parts - but the project has "just" begun...

So who knows how will it end... I can feel that it will raise as time goes by...