Just last year, Buick introduced the larger Park Avenue and supercharged Park Avenue Ultra; this year, they offer optional OnStar global positioning and cell phone systems.

The midsize Century and Regal continue to go in differing directions. The Regal attracts the performance crowd, especially in its supercharged 240-hp GS trim, while the Century boasts features galore for a $20,000 tariff. Skylark enters its final year of production. The full-size Riviera may also be on its last legs.