What's new for 2007: More powerful engines for the V8 models. The CLK550 replaces the CLK500, with a new 5.5-liter engine generating 27 percent more power than the previous 5.0-liter V8. The ultra-high-performance CLK63 AMG Cabriolet replaces the CLK55 AMG, with a hand-built 6.2-liter V8 producing 475 horsepower. Also new for 2007 is a Sport Appearance Package ($490) for the CLK350. It includes a firmer sport suspension, cross-drilled brake rotors and 10-spoke, 17-inch aluminum wheels.

The Mercedes-Benz CLK is available as a coupe or convertible. Three models are distinguished by engine size, and all come with a seven-speed automatic transmission that can be shifted manually with buttons on the steering wheel.

The CLK350 Coupe ($46,200) and Cabriolet ($54,200) are powered by a 3.5-liter V6, which develops 268 horsepower and 258 pound-feet of torque.

Standard features include leather upholstery, dual-zone climate control with pollen and dust filter, 10-way adjustable power seats with three memory settings and rain-sensing windshield wipers. Black-stained ash wood trim is standard, and more traditional burl walnut is available as a no-charge option. The Cabriolet features a fully automatic, heavily insulated convertible top.

The CLK550 Coupe ($54,900) and Cabriolet ($62,900) get the new-generation V8 introduced in the big S-Class sedan. This dual-overhead-cam 5.5-liter engine generates 382 horsepower and 391 pound-feet of torque.

The CLK63 AMG ($89,200) is available only as a cabriolet. Its 6.2-iter V8 is built by a single technician at Mercedes' AMG racing subsidiary, with 475 horsepower and 465 pound-feet of torque. The CLK63 also gets sporting upgrades to its brakes and suspension, and comes with a longer list of ultra-luxury features.

Options are grouped in three packages: Premium I, II, and III. Exact content and price vary with the model. On the CLK350 Coupe, Premium I ($2,530) includes auto-dimming mirrors, a programmable built-in garage door opener, a premium harmon/kardon stereo with six-CD changer and a glass sunroof. Premium II ($3,630) adds turning bi-xenon headlights with washers and a heated windshield washer system. Premium III ($4630) includes everything in PI and PII, plus ventilated seats.

Stand-alone options include a navigation system combined with on-screen control for the stereo and air conditioning ($2,270); Sirius satellite radio ($510); hands-free telephone communication ($925); wood and leather steering wheel ($540); heated front seats ($700); electronic trunk closer ($520); and Keyless Go push-button starting ($1,100). For that extra special touch, designo Silver Edition and Graphite Edition trim packages are available ($7,050).

Safety features that come on all CLKs include multi-stage front-impact airbags. Coupes get front passenger side-impact airbags that protect the torso, and curtain-style head protection airbags for both front and rear passengers. The convertibles combine both torso and head protection in the same side-impact airbags. The also feature pop-up rollbars that automatically deploy if the electronics sense a pending rollover. TeleAid accident notification is standard. Side-impact airbags for the rear passengers are optional ($390). Anti-lock brakes (ABS) with emergency Brake Assist and Electronic Stability Control are standard. The Extended Mobility package ($200) includes run-flat tires and a tire pressure warning system. 4Matic all-wheel drive adds a measure of safety in slippery conditions.