This is mine....

1. Ray Robinson
2. Muhammad Ali
3. Willie Pep
4. Henry Armstrong
5. Benny Leonard
6. Gene Tunney
7. Joe Louis
8. Stanley Ketchel
9. Lou Ambers
10. Archie Moore
11. Pernell Whitaker
12. Carlos Monzon
13. Alexis Arguello
14. Emile Griffith
15. Kid Chocolate
16. Ray Leonard
17. Roberto Duran
18. Jack Dempsey
19. Oscar De La Hoya
20. Julio Cesar Chavez

Not the best list and I'm sure it could use some fine tuning, bit of era-clumping in there but I like it. And as always, I will gladly defend each fighter's spot on the list.