Audi RS4

The Audi RS4 is one of the most capable and competent sport sedans on the market. The 420 horsepower V8 gives the Audi RS4 an incredibly quick 0-60 time of 4.8 seconds, and with 90% or more of the engine's 317 lb-ft of torque available between 2,250 and 7,600 RPM, the Audi RS4 has the power to slam your skull back into the headrest at almost any speed. The engine's 8,250 RPM redline just adds to the grins.

But the Audi RS4 is more than an Audi A4 with a souped-up engine. Specially tuned Quattro all-wheel-drive and a specially modified suspension give the Audi RS4 unbelievable handling ability, and its electronic stability control system is programmed to let you slide the car through the corners while maintaining enough control to keep from sliding right off the road. What's even more amazing is that the Audi RS4 makes a wonderful family car. It has a decent back seat, generous trunk, a gentle clutch and a firm yet surprisingly comfortable ride. This isn't just a car for track days; it's a car you can live with, day in and day out.

Source:cars.about.com