Buick yet again brought a stunning concept  to Detroit. The Avista is a long low-slung coupe that seems to offer a bit of the Buick glamour that existed in yesteryear. Just like the Avenir concept of last year’s show, it is gorgeous to look at, but looks nothing like the current tired designs that fill Buick lots. Intended as a grand tourer, the rear-wheel drive Avista uses a twin-turbo V6 good for 400 horsepower and rides on the same platform as the Camaro.