To be sure, Audi's A4/S4 line is more than sedans. For 2007, all-new convertibles augment the existing four-door models and wagons. Also new is the ultra-high performance (and at $66,000, expensive), 420-hp RS4. From the enthusiast driver's perspective, it's one of the best sedans ever.

The A4 line is complex, with 21 variants. The key is thinking according to priorities: body style, engine size, front- or all-wheel drive, transmission type. All are nicely balanced, enjoyable automobiles.

The A4 2.0T, still priced well below $30,000, is fun to drive. Its turbocharged, 200-hp four-cylinder is one of the better small engines going, with satisfying response and spry acceleration, particularly with the standard six-speed manual transmission. It corners like a sports sedan, and high-quality construction is evident inside and out. Audi's optional quattro all-wheel drive system can help keep the driver on the road regardless of the conditions or situation, and buyers don't have to choose a big engine or special model to get it.

Going up the line, there's a smooth V6 and two powerful V8s. Those who frequently carry gear, dogs or cargo will appreciate the A4 Avant, which offers the extra space of a wagon while maintaining the A4's sporty driving character. The new convertibles are stylish, sexy and reasonably practical, and they don't have to cost an arm and a leg. The S4 models will appeal to enthusiast drivers who crave their lusty power and sporty handling, for a lot less cash than the RS4.

Every A4 should appeal to techies. State-of-the-art engines feature direct fuel injection: the cleanest, most efficient means yet devised to blend gasoline and air in an engine's cylinders. Transmission choices include a six-speed automatic with Tiptronic manual-shift feature and an efficient continuously variable automatic (CVT) that delivers truly seamless shifting. Sophisticated suspension technology is augmented with electronic stability control, which can help the driver avoid a crash. The A4 is stuffed with safety features and offers rear side-impact airbags, while most cars in its class don't.

Unlike other tech-heavy cars, the gizmos blend nicely in the A4, enhancing comfort, convenience and safety, and improving the driving experience.

The A4 can be pricey and it's relatively small. On the other hand, you'll have to look long and hard to find a car that blends driving satisfaction, safety, convenience, practicality, great finish and reasonable ownership cost as well as the A4.