These lists are so subjective, but I'll give it a shot.

1. Pacquiao
2. J.M. Marquez
3. Vazquez
4. Calzaghe
5. Cotto
6. Hopkins
7. Rafa Marquez
8. Mijares
9. Pavlik
10. Guzman (based on skills, he'd be higher if he'd fought better competition)