Big Thunder: Three power-stormers converge in the sleepy German countryside to wake the locals and make some noise
2007 Audi RS4 vs 2008 BMW M3 vs 2008 Mercedes-Benz C63 AMG - Comparison - Motor Trend
1st place: BMW M3 
Driver's choice for fantastic agility, tenacious cornering grip, sky-splitting road thunder.
2nd place: Mercedes-Benz C63 AMG
Class, poise, thrills to spare and the racer's choice--almost the perfect stormer.
3rd place: Audi RS4
All-weather crowd-pleaser, ready for action, M3-fast; maybe just a bit too predictable.