The Audi A4 is fun and spirited in any of its 21 variations. It delivers plenty of power, respectable gas mileage for its class, state-of-the-art sound and, above all, an integration of various systems that give it depth and a high level of driving satisfaction. Interior space is tighter than in many competitors, but Audi's quattro all-wheel drive system remains the benchmark. Prices range from the very-high $20,000 range to just past $70,000, when loaded with options. If you plan to look at entry-luxury sports sedans, we recommend that the A4 be one of them.

NewCarTestDrive.com correspondent Tom Lankard filed this report from Tucson, Arizona; with Mitch McCullough in Monterey, Greg Brown in Los Angeles, and J.P. Vettraino in Detroit.