After researching films from '501 must see movies' and 'IMDB' I will have to choose one film from the list I have gained.
Action:
Die Hard.
Braveheart.
Gladiator.

Comedy:
Austin Powers: International Man of Mystery.
Theres Something About Mary.
Meet The Parents.

Romance:
Pretty Woman.
Sleepless in Seattle.
Romeo and Juliet.

Titanic.

Thriller:
Reservoir Dogs.
Pulp Fiction.
Leon.
Se7en.
City of God.

Gangster:
Goodfellas.
American Gangster.
Mickey Blue Eyes.
The Departed.

Also from researching these films I have also found out who edited each of these films and who directed each of these films. Also I have found out that most of these films had a nomination for best film editing in the academy awards, and some films even won the award. I will watch each of these films and chose the best films to study the editing techniques of.