Frankie Edgar, has decent foot movement.
Melvin Guillard, knows how to find distance.
Junior Dos Santos, actually uses body shots.
A Korean boxer, I forgot his name, just got a knockout in under 8 seconds at a UFC event, has shown good boxing fundamentals in his fights.
Gegard Mousasi, also uses sound boxing technique, has even competed in boxing and kickboxing.
Anderson Silva, has the best boxing in MMA.
Fedor Emelianenko has good, if sloppy, boxing. His brother Aleksander is good at boxing as well.
Andrei Arlovski was good at boxing, too bad his has a terrible chin.
Cain Velasquez knows how to throw hooks when on the inside.
Nick Diaz, Big Country Roy Nelson, Tito Ortiz,and Diego Sanchez are all overrated and have sub-par boxing.