I rewatch fights all the time, but for enjoyment purposes.  Never to re-score them shyts.  My 1st opinion of a fight is the one I go with 99% of the time because it's the most pure.  
Within the last 3 or 4 weeks I've rewatched
Tyson/Holyfield 1 (1st time in years.  Noticed that Watson nikka walking Evander into the ring.  Great national anthem by Gerald and Eddie Levert too)
Pryor/Arguello 1 (1st time in years too, Top 10 fight of all time to me.  Even shorty sits down and watches this one with me.)
Leonard/Hagler (I just love this fight.  Great boxing and pressure fighting)
VHS tapes that I keep out nearby an not in the tote locker archives because I watch them frequently are....
Mitchell/Tackie - I loved this fight.  Big Shramba Mitchell fan and he outclassed the fukk outta dude.  Even dropped him for the 1st time late.
Bryd/McCline - Great fight of a lil nikka beating a big nikka just off of skills.  Bryd went from getting dropped early to almost KOing McCline.  That 6 punch combo he threw had me like 
 Hatton/Malignaggi
Hatton/Malignaggi - I can't stand Paulie and I love seeing him get his ass kicked especially since he downplayed dude beforehand.  
There's others but those are the ones that come to mind first.