LOL, well not to disappoint:

10 Sammy Angott
9 Julio Cesar Chavez
8 Bob Montgomery
7 Ike Williams
6 Battling Nelson
5 Joe Gans
4 Pernell Whitaker
3 Henry Armstrong
2 Benny Leonard
1 Roberto Duran

Mentions: Jack McAuliffe, George Lavigne, Frank Erne, Tony Canzoneri, Barney Ross, Lou Ambers, Beau Jack, Jimmy Carter, Carlos Ortiz, Ken Buchanan, Esteban DeJesus, Guts Ishimatsu (Ishimatsu Suzuki), Alexis Arguello, Edwin Rosario, Jose Luis Ramirez, Hector Camacho Snr, Oscar de la Hoya, Shane Mosley, Steve Johnson, Jose Luis Castillo and Floyd Mayweather Jr

1 and 2 pick themselves, some put Benny ahead, I can see why. Leonard and Duran are so even, it is case of picking the style you prefer IMO.

Looking at the mentions, it shows you how strong the division is; Canzoneri, Ross, Ambers, Buchanan, DeJesus and Mosley would all surely of found their name on virtually any other divisions top 10?