i've watched all the toplist of horror (pertaining to ghost) films includes indie films and
imho; these following films are quite good and should be remembered.
The Exorcist (1973) - still fresh in my mind.
4bia (2008), 4bia2 (2009) - should be listed in best asian horror.
3extreme (2004) - a very good compilation and provides a lot of thinking.

meanwhile,if you're looking for horror & thriller,a bunch of good films and it should be a tough job to compile those in the greatest horror of all time and you might consider these;
dream home (2010)
Inside(A Linterieur)(2007).Unrated.
You re Next (2011).
I Saw the Devil (2010)
Would You Rather (2012)
The Loved Ones (2009)