Who are your top 20 pound for pound boxers of all time ?

In no set order, Here is my list of the all time top 20 pound for pound champions - 1. Muhummad Ali, 2. Sugar Ray Leonard, 3. Pernell Whitaker, 4. Floyd Mayweather Jr., 5. Roy Jones Jr., 6. Sugar Ray Robinson, 7. Henry Armstrong, 8. Wilfred Benitez, 9. Roberto Duran, 10. Oscar De La Hoya, 11. Felix Trinidad, 12. Shane Mosley, 13. Julio Cesar Chavez, 14. Marco Antonio Barrera, 15. Aaron Pryor, 16. Juan Manuel Marquez, 17. Carlos Monzon, 18. Thomas Hearns, 19. Marvelous Marvin Hagler, 20. Bernard Hopkins.....nuff said !