Expensive if done by Audi dealer! They charge way too much for the brake discs. £620+ inc VAT for front pads and discs and that not including labour! What is wrong with the calipers?
I've only changed by rears so far (by myself), went for Akebono ceramic (low dust) brake pads and Zimmermann Sport:Z (cross-drilled brake discs. I will do the same for the fronts (but still undecided whether to go with plain (like OEM) or cross-drilled again. But I checked my front pads recently and they are still very chunky!
I am in Spain, DIY is not an option. I went to a non-franchised garage who ordered wrong pads and fukced up when re-installing my old pads. Gave me back the car in a dangerous condition. You will note the clearance between pad and disc. Lesson learned ; never trust any Brit tradesman in Spain.
It is currently with a Spanish garage who are attempting to repair the damage.