A few of my personal favorites:

Joint Security Area and Old Boy - two movies of totally different style from brilliant Korean director Park Chan-wook

A Separation - an excellent Iranian family drama, great actors, a surprising script, my personal favorite from the last few years

Reservoir Dogs - and almost all Tarantino movies

Gran Torino - Clint's beautiful farewell

The Celebration - Dark comedy/drama, the highpoint of Danish Dogme 95 movement for me

If you liked The Celebration you should check out The Hunt, by the same director.

Thanks for the tip!

In no particular order: Shawshank, Goodfellas, Raiders, The Professional, Out Of Sight, Raising Arizona, Glengarry Glen Ross, Rushmore. Oh, and, obviously, Ghostbusters.

I wish I could say something like Aguirre, or Tokyo Story, but that's the honest list.