Whose full career should I watch?

I am probably more than a casual fan, but of course there has been so much boxing over the years that I haven't seen everything. I'd like to watch the entire career of an entertaining fighter, or at least what was recorded of it. I'm just bad at deciding. Please keep it to the 1970s and up for the sake of video quality. I tend to prefer 160 lbs and under, but I'll watch heavier fighters if they're active and don't clinch too much. Thanks for your help!

I've seen/enjoyed every fight from the following guys, so please don't bother to name them:
Sugar Ray Leonard
Julio Cesar Chavez
Naoya Inoue
Manny Pacquiao
Muhammad Ali
Mike Tyson
Evander Holyfield
Floyd Mayweather Jr.

EDIT: Thanks all. I've seen at least one fight from almost all of these fighters and they're all good suggestions. I'll go with Hagler and Usyk for the time being since they got the most upvotes