on the topic of foreign films,

Amores perros — if you like unconventional drama
The Science of Sleep — if you are quirky
July Rhapsody — high school student tries to seduce teacher
Il Mare — original of The Lake House, more captivating in spite of the premise, better ending, tearjerking
Internal Affairs 1 & 3 — original of The Departed, better interplay between the undercover cop and the bad cop, more story