Trick is to find "your definitive favorite"
for each genre...here are some of mine:

Goodfellas
Miller's Crossing
Once Upon A Time In America
Blow
Usual Suspects
Reservoir Dogs
Pulp Fiction
Boys In The Hood
Menace II Society

Seven Samurai
Zatoichi (orig and remake)
Sanjuro
Kagemusha
Ran

Sillence of The Lambs
Sixth Sense

2001: Space Odyssey
Aliens
Blade Runner

Saving Private Ryan
Thin Red Line

Wyatt Earp

Goodwill Hunting

A Few Brave Men


TV Series:
Sopranos season 1-3
The Shield Season 1-2
6 Feet Under Season 1-2
West Wing Season 1-2