General Motors promises better product differentiation and less overlap between brands as new models roll out. It’s a point hammered home anytime the talking heads from Pontiac and Buick draw a crowd. Therefore, despite sharing its platform with the GMC Acadia and the Saturn Outlook, the 2007 Buick Enclave has a premium style meant to be all its own. In its current concept form, the Enclave rides on 21-inch wheels, and is powered by a 3.6-liter, 270-horsepower engine joined to a six-speed automatic transmission. The Enclave, which will replace the Rendezvous and Rainier in Buick’s lineup, will offer all-wheel-drive and an independent suspension. The interior is swathed in supple leather and gets plenty of wood trim, and the Enclave shows a level of refinement most people are used to seeing in a Lexus – which is exactly what Buick would like to achieve, pointing out that the Enclave will have an especially quiet, luxurious ride.