My lists tend to change more times then often but for the most part it's always one of 2 names for a div. it's simply a matter of fighters you know or don't. I can't rate Greg, Benny or Langford cause I just haven't seen enough of them to rate them.
So here goes:

Ali
Holyfield
Foster
Calzaghe
Monzon
Norris
SRR
JCC
Duran
Arguello
Sanchez
Morales
Olivares
Roman
Canto
Gonzalez
Lopez