If you're looking to study technique, Ricardo Finito Lopez, Ruben Olivares, Ernesto Marcel Eder Jofre and Fighting Harada would be some good names to look at.
A lot of really great fighters have already been mentioned so I would add the Grudge Matches in-between Rafael Bazooka Limon and Bobby Chacon. Their four fights always stood out to me because these two genuinely hated each other.
Here are my faves that come to mind: Little Red Lopez Bobby Chacon Azumah Nelson. Eric Morales Johnny Tapia Riccardo Lopez and some guy named Manny Pacquiao
Naya Inoue. And he has the benefit of being young and in his prime right now, so you can watch his fights in clear HD video.
