the best hair in the entertainment business is on the heads of Cher, Oprah Winfrey and Paulina Porizkova, according to a survey this week at the Midwest Beauty Show in Chicago. Variable coiffures earned lots of points for Cher, who "creates fantasy with her hair," according to one respondent in the poll, and runner-up Winfrey, "who does something different with her hair each day," said another. Porizkova, who finished third in the poll, was cited for having sexy tresses. Michelle Pfeiffer, Robin Givens, Sigourney Weaver and Ivana Trump also were singled out for nice hair, but Marilyn Quayle, wife of Vice President Dan Quayle, was castigated for sticking with her 1960s flip hairstyle.