Camino (2008) http://www.imdb.com/title/tt1206285/
probably not so unknown in the spanish market (it won the equivalent of the oscars, the Goya), but you gringos might not know it....it will make you cry for sure, and at the same time it will show you how senseless religion (specifically the opus dei) really is.

Primer http://www.imdb.com/title/tt0390384/
it's been mentioned here a couple of times, but why not again.