I got my RS6's from
www.alloywheels.com and they are OK. You have to remember that you get what you pay for and their customer service isn't exactly amazing but then your not paying top dollar either. The wheels have covered 40k miles in a year and they still look like new (other then the kerbing the Mrs gave one of 'em). I'd use them again.
Fit straight on with no rubbing or messing around and my car is lowered about 25-30mm on Eibach springs.