Vonnegut, Styron, or Mailer

You may have seen an AP story on Sunday about the year's literary losses---Kurt Vonnegut, William Styron (who actually died in late '06), and Norman Mailer. I have a personal favorite among the three. But what about you? Which of those authors, if any, had an impact on you? What was the nature of that impact? Let me know, and then I'll let you know my choice.