I researched buying my next car based on performance, exterior design, interior ergonomics, and overall quality.  My choices were narrowed down to the Lexus IS-F, Mercedes C63 AMG, BMW M3 (new look) and Audi RS4.  After driving all of them I ended up liking the Mercedes and Audi the best of the four.  The BMW's transmission and shifter didn't feel as good as it should for the brand and price point, and the M-DCT wasn't out at the time I needed to buy a car.  The IS-F was too polarizing, both inside and out.  I didn't like the fake exhaust, either.  The Audi was the most balanced of the four - and the all-wheel-drive quattro system was really apparent on wet pavement and mountain roads.  The styling worked for me, the powertrain worked for me, and the interior was top-notch in qualities, if not a bit old-fashioned-looking, which I preferred anyway.  Great machine.  No problems in 6,000 miles of driving.  

Cant Get Any Better Than This, The Best Four Door Car I know And Ever Will!!