Significant cars from the 1990s are harder to come by than meaningful models of the '60s, '70s or '80s, but there are some gems to uncover. A few represent points in a model's evolution, steppingstones to where they are today; others are game changers from a design, technology or purely philosophical standpoint. Still others are significant on a more personal level. Here 18 rides that represent the best of the decade that brought us "Dances With Wolves," "Silence of the Lambs," "Forrest Gump," "Titanic" and President Bill Clinton. 1990 Chevrolet Corvette ZR1 American iron didn't get any more