Mintex ones from ebay are good and get good reviews from other members. I have been having euro car parts "pagid" discs and pads (audi pads are pagid)but i have had to have them changed twice under warranty-now good and 10k+ miles on them.
hope that helps Mike
I believe I'm correct in saying that Audi discs have a secondary coating applied to the non braking surfaces. This really does help in slowing down the rusty disc look. I'm not aware of any of the other discs having this silver/grey coating. I know some discs have been black coated or a form of cad plate.