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The Mercedes SL63 AMG, oddly enough, is a 518-horsepower retractable-roof two-seater for people who don't need to show off. Mercedes and AMG have taken the V-8 version of the SL luxury sports car in a more aggressive direction. The SL got a facelift for 2009, but still uses the basic platform that made its debut for the 2003 model year. The Active Body Control suspension provides a supple ride, but there's something disconnected about the feel it imparts during hard driving -- those heated, 12-way adjustable leather seats are loath to afflict the driver's posterior with rude news from the road below.

The confident and muscular new BMW Z4 is the most luxurious convertible this side of $100,000. It is undoubtedly one of the best do-overs in recent years, designed by Juliane Blasi and Nadya Arnaout of BMW's Munich design studio. The new car, now with a retractable metal roof rather than a soft top, soothes rather than strains the eye. Two obvious advantages of the folding metal top are readily observed: the cabin is virtually as quiet as any conventional hardtop, and it ends worries over the decline of a fabric top. But the aluminum panels and the top structure add roughly 200 pounds compared with a soft top; the Z4 can reach 3,500 pounds, about 200 pounds more than a Corvette convertible. And as with most retractable hardtops, this designer sandwich, once folded, leaves room for little more than a few side dishes.

The Mercedes-Benz GLK stands out due to its bombastic styling, eschewing the generic oblong crossover shape in favor of upright, angular bodywork. Most crossovers seem shaped by the wind. The GLK, meant to evoke the boxy G-Class S.U.V., looks as if it were left in the path of a retreating glacier. While the 2010 GLK appears blunt, its coefficient of drag is only 0.35, the same as a Porsche Cayenne and surely far better than the G-Class. Like any crossover in search of a bit of street cred, the GLK wears oversized wheels. The central control knob and seven-inch in-dash LCD screen are up-to-the-minute and quite intuitive to use. Scrolling through radio stations is particularly easy, as the display screen mimics an analog dial and the knurled control knob becomes the tuner. The interior can also be optioned up with some of the toys you'd expect on a bigger S.U.V., like dual rear-seat flat-screen TVs and a panorama glass roof that extends over the rear seats. The base rear-drive GLK is priced at $34,775. All-wheel-drive adds $2,000. It's a sign of the times when a Mercedes sport utility wagon begs to be considered from a value perspective.