The black does look nice ... I almost did mine black but thought I would give the white a go and if it didn't work out then have them dipped and painted black
I got some of the S-Line decals from this seller on Ebay - AUDI S-Line Premium Brake Caliper Decals Stickers TT RS A3 A4 A6 Q5 R8 Quattro | eBay
I have an a4 avant in white and was going to do the calipers in black but the white looks really good!
Did you use Hammerite white paint?
Have you got the link to the s-line stickers?
I got the exact same ones from the same seller, those decals are too big for the rear calipers on the facelift, not sure about the pre-facelift ones though
I had to buy a second set for the rears from here:
Brake caliper decals to fit Audi S Line sticker small x1 | eBay
Waiting for them to be delivered for me to try and fit
The ones I got are a three pack with large, medium and small so I put the small on the rear and the medium on the fronts and the large are going on the tool box