I'm a big fan of horror movies but i don't like answering questions like this as i'm not scared of horror movies and most members who ask this question(asked frequently)don't go into some detail of the kind of movies they're looking for,so i don't know what kind of horror movies you're interested in or the kind of horror movies that you find scary.
Comments
May be you like
Intruders
Mientras duermes (Sleep Tight)
Akmareul boatda (I Saw the Devil)
Secuestrados (Kidnapped)
The Descent
[Rec]
Ils (Them)
The Unborn, Haunting in Connecticut, Drag Me to Hell, Devil, Paranormal Activity 1 2 and 3
Well, some stupid ones
Paranormal Activity 1-3
Insidious
Then good ones
Sort of Blair Witch Project
The Exorcist 1 only
I'm a big fan of horror movies but i don't like answering questions like this as i'm not scared of horror movies and most members who ask this question(asked frequently)don't go into some detail of the kind of movies they're looking for,so i don't know what kind of horror movies you're interested in or the kind of horror movies that you find scary.
Anyway here are some movies that i like,
Haute Tension
http://www.imdb.com/title/tt0338095/
Inside
http://www.imdb.com/title/tt0856288/
BabySitter Wanted
http://www.imdb.com/title/tt0819755/
The Collector
http://www.imdb.com/title/tt0844479/
Insidious
http://www.imdb.com/title/tt1591095/
The Descent
http://www.imdb.com/title/tt0435625/