My favorite films...
Citizen Kane
Palindromes (Todd Solondz)
Inland Empire (David Lynch)
A Ma Soeur (French Version) (Catherine Breillat)
Mississippi Burning
Mr Smith Goes To
Washington
Metropolis (Fritz Lang, Murnau Restoration)
Apocalypse Now
Natural Born Killers (Director's Cut)
The Prime of Miss Jean Brodie
In no particular order.
It's hard, there are so many!