The sleek Buick Invicta show car revealed here in conjunction with Auto China 2008 is Buick's strongest statement yet of its deliberately international plans. The four-door midsize sedan with a coupe-like roofline presents a bold direction for Buick's new generation of vehicles in the world's two largest vehicle markets - the United States and China. Invicta has evolved from Buick concepts such as the 2004 Velite convertible and 2007 Riviera coupe, both of which received accolades...