2008 BMW 3 Series 335i 2dr Coupe (3.0L 6cyl Turbo 6M)
I previously owned an '07 Cayman S. This car is a beautiful compromise between a sports car and a luxury car. It is tight, fast, and comfortable. It is easy to drive. The gas mileage is surprisingly good if driven conservatively. I was leery about the run-flats, but I have to say I don't notice a harsh ride or excess noise (especially compared to the ride of the Porsche in sport mode, with conventional tires). The options do push the price up.
Performance of the twin turbo engine. Stereo. Good looks. Crisp shifts when driven in sport mode. The readability of the dash/nav in bright light is excellent. I actually like the cupholders.
Limited slip differential would be nice. Improve the ease-of-use of the nav system (think Acura RL).