[Salvy_Mic]

You'd get some wildly different lists here, but this is my top 20.
20. Roy Jones Jr.
19. Julio Cesar Chavez
18. Archie Moore
17. Rocky Marciano
16. Larry Holmes
15. Jimmy Wilde
14. Alexis Arguello
13. Mickey Walker
12. George Foreman
11. Marvin Hagler
10. Sugar Ray Leonard
9. Jack Dempsey
8. Jack Johnson
7. Benny Leonard
6. Roberto Duran
5. Willie Pep
4. Joe Louis
3. Henry Armstrong
2. Muhammad Ali
1. Sugar Ray Robinson

Of course, I'm going on the basis of most accomplished...if you're basing just on pure boxing talent and ability, then guys like Roy Jones, Floyd Mayweather, Pernell Whitaker, Ray Leonard, and Salvador Sanchez would all easily be top 10, with a top 5 of Robinson, Ali, Pep, Benny Leonard, and Jack Johnson.