As a bit of a Johnny come lately to this fight game, and have only turned up in recent years, here's the pick of the ones I've seen:

Maccarinelli v Hobson I
Calzaghe v Lacy
Duddy v Yory Boy Campas
Macklin v Moore
Hatton v Tzuyu

and seeing an ageing B-Hop school the champ Antonio Tarver was a real eye-opener in how to look at champions and how good they really are.
Anyhow, keep posting your recommendations, so that this poor impoverished Welshman can keep digging into the history of the sport.