The Swedish movie "Let the Right One In", based on a novel by John Ajvide Lindqvist, was incredible. It's not the scariest movie I've ever seen, but the way he portrays vampires is awesome. It's a different perspective than usual. It's such a beautiful story, and with a very happy ending. His novel was published in 2005, then they made a movie in 2008. Now there is a new English version of the movie called "Let Me In"... it's not a complete slasher film, but if you're looking for an amazing story I highly recomend it:
http://www.youtube.com/watch?v=reRRAEVHq8E