Ray Leonard, particularly at WW. Below Ray but I personally would also rate Kostya Tszyu quite high as boxer/puncher.
I qualify Muhammad Ali, Salvador Sanchez, Eusebio Pedroza and Sugar Ray Leonard as boxer-punchers. Macho Camacho was a notch behind them in that category since he had a lower percentage of knockout wins, but he was a boxer-puncher as well. Not by much but nevertheless.
Kid Gavilan..was he a boxer puncher? Also Luis Manuel Rodriguez and Jose Napoles,all of them can box comfortably on he outside and slug it rough inside.
Lot of great shouts in this. First that came into my head was Hagler, mentioned obviously. Manny Pacquiao if not already mentioned, very much ticks lots boxes in the discussion.
He was very accurate with most,if not all of his shots though,and cracked a good chin in Gil Turner. Rodriguez could hit hard,but chose to be pretty,he made Moyer unable to beat the count.