Kate Beckinsale
A lot of people comment on how the actors in this left the profession. Consider Kate Beckinsale's career. She had far more recognition than any of them, and for the last decade or so her roles have . . . well, they've paid the bills. But the actress who nailed Lady Susan hadn't many chances to show those chops playing vampires or Adam Sandler's wife.
Being able to play a witty, intelligent character is no road to riches in America.