Hey Matt, you are correct, I did have my 550 calipers done...
I paid £250 at a place in nottingham <
http://www.brake-caliper-painting.com >
I drove there very early in the morning, they took them off for me, blasted, painted etc, then re-fitted...
I had no brakes on the way home as a diagnostic machine is needed to bleed correctly (ABS, etc), so then had Roberto sort them for me,
at which point the paint near the bleed nipples discoloured straight away, so even though I thought the price was good, there is no way I would have them done there again.
At some point mine will go back to RED as they should be, and i will go here:
https://www.facebook.com/pages/Pro-caliperscouk/175742892481364
They are not cheap, but they look great.
Decal wise, I can also vouch for supergraphicsf1.com I have bought a couple of sets from them and they are very good.