If you're looking for a thrill, spend the cash it takes to park the Audi A8 4.2 in your driveway on the smaller but infinitely more exciting Audi RS4. The A8 is, after all, a luxo-cruiser first and a performance sedan second. Nevertheless, the Audi is more exciting to drive than some of the other models in this class, namely the Lexus LS and Jaguar XJ.