Go to:   Buick Velite Buick has raised hopes with several concepts in recent years, only to dash them. But at a Tuesday evening unveiling at Manhattan's swanky Splashlight Studios, Buick execs insisted the Velite concept stands a genuine chance of reaching production. The stretched four-seat convertible is derived from the new Zeta platform that will underpin premium models from GM and its Aussie Holden subsidiary; the concept was built by famed Italian coachbuilder Bertone. A twin-turbocharged, 3.6-liter V-6 produces 400 horsepower, hooked to a six-speed automatic transmission. The soft-top Velite draws cues from Buick's design past, including a boattail rear and portholes in the front fenders.