I would have to say the RSC one piece wheels that look similar to the Audi RS6 wheels, I didn't think the RSS suited the A3/S3! Whatever you do, buy some aftermarket silver valve caps as you'll get the Kahn-logo caps nicked by any kid on a bike - latest craze for them!! Had mine nicked loads of time and ended up going for silver locking ones! Make sure you get chrome valves too as they look much better!! Most dealer will through these in for free if they don't already come with the wheels!
Let us see some pics when you have them mate!
Naresh