I really liked The Awakening. This is one of those ghost movies where you want to watch it a second time, to see the clues as to who was the ghost- and who could see the ghost.
Set in a boarding school out in the British countryside, after World War I, The Awakening has it all: beautiful scenery, good acting, suspenseful story line, a twist at the end, and it moves along at a good pace. The central character is a "ghost disprover," for lack of a better term, that is called in to debunk that a ghost caused the death of a student. Despite her state-of-the-art scientific equipment and her steely resolve, she slowly realizes that there is indeed something supernatural going on in this school. And Yes, she is involved in it.
Throw in the romance/sexual tension between the ghost disprover and the handsome, wounded WWI vet that teaches at the boarding school, and you've got an outstanding ghost movie. Rachael Hall plays the beautiful, repressed, tightly wound ghost disprover who sees everything she knows get turned upside down... but who gets the truth and a good guy in the process.
I'd say The Awakening is a mix between ghost movies The Sixth Sense, The Others (with Nicole Kidman), and some other recent ghost movie that relies more on spooky intrigue than blood and guts and horror. Pick one!
So watch The Awakening. Be ready to watch it a second time too, to catch the clues you missed the first time.