undeadcow: Atrotcious (2010) is a spanish found footage film that's surprisingly creepy.
The Mother's Day (2010) remake is a tense home invasion style horror film.
Sauna (2008) is a cryptic historic Finnish horror movie.
The New Daughter (2009) is an over looked but effective horror movie; nevermind Kevin Costner helming it's better than you'd guess.
Tourist Trap (1979) is really cool sort of House of Wax and Texas Chainsaw Massacre hybrid.
V/H/S/2 has some intense segments but might venture too far into WTF mode.
The Blair Witch Project scares me, but I think that's too much a niche film that might not strike fear in everyone.
Also seconding The Orphanage and Event Horizon.
May I suggest EVENT HORIZON which inspired Dead Space or get Silent Hill anything Stephen King