Shh you, looking at your project was the cause of these thoughts to enter my mind!
Its totally worth it......I'd be quick though as when I asked Alex last week he only had one fitting kit left and it wouldn't surprise me if its gone already.
My mechanic asked me today "how much?". Everyone will pay a different price. I managed to find calipers that were quite cheap (Thanks Alex for the tip), the TTS discs are quite cheap and you could put regular Pagid pads in (but opted for RS4-2's) and the fitting kit is £250ish. All add's up to quite a few £'s.
Obviously you can go nuts and have floating discs and better pads but it's all up to you.
They look better, brake better, better feel under the foot with more control, and are lighter than normal GTi brakes so will be loads lighter than S3 brakes......Just ask MR Wigley how heavy they are!