I may not believe in ghosts, but I do believe in beings "higher" than myself. Whether higher means that they are more consciously aware of the world than I am or can just fly with their minds, I don't know.
Kind of sounds like the Mothman Profecies, which is a movie I highly recommend. I do not scare easily except to those movies where, when you think about the message behind it, it'll scare you.
I didn't have a dark man in my doorway, but there was something that did terrify me. Check out
http://www.tfproject.org/tfp/showthread.php?t=81650
I had a dream that was lucid than most, which always make me nervous when I wake up in my dreams and the man that talked to me in it. He gave me a message that let me see... something one night. Check it out if you like.