Cadillac's flagship sedan, 2011 Cadillac STS AWD, has a personality all its own: bold and invigorating, with performance and handling to put some sports cars to shame, yet at the same time thoughtful, luxurious – even soothing. The cabin is spacious, comfortable, trimmed in fine leathers and equipped with a long list of amenities. Performance-wise, STS offers leading-edge power ranging all the way up to STS-V's astounding supercharged Northstar V8. Best of all, STS road manners are as advanced as its engines, thanks to a sophisticated fully-independent suspension, track-tuned at Germany's gruelling and legendary Nürburgring. Bottom line: if you're looking for innovative design and outstanding engineering in a performance luxury sedan, the 2011 STS AWD is a must-see, must-drive car.