My top choices are
1.Wilfredo Gomez
2.Carlos Ortiz
3.Felix Trinidad
4.Wilfred Benitez
5. Edwin rosario
I have to give the #1 spot to Gomez(call be biased
I think Ortiz deserves the #2 spot he was a great boxer with great skill and beat the top fighters of his era, one of my personal favorites of all time.
After that is gets pretty tricky for me. I know some modern fans will probably have Tito #1 but I think it's safe to say he did not accomplish as much as Gomez and Ortiz did hell I'll probably even put Benitez ahead of Tito.
As for Rosario I know some might not have him up that high but this maybe another case of just being biased from my part. I grew up watching "Chapo" he always put up great fights and even in defeat he was still impressive.