I'd also recommend Martyrs. Some other flicks I'd recommend.
1) The seasoning house (It is more of a revenge flick but I thought it was pretty darn good - the protagonist is a deaf and mute girl - hard to watch in places)
2) A tale of two sisters (This you have gotta watch)
3) Dead Silence ( Ghost story)
4) The Midnight Meat train (One of the better clive barker on screen adaptations)
5) Cabin Fever 3 (If you haven't seen earlier iterations then you might want to check those out too)
Some classics:
1)Dellamore Dellamorte (A personal favourite)
2)Tombs of the blind dead (love this one)
Horror comedies.
1)Tucker and Dale vs evil (I love this one)
2) Trollhunter (Bloody Hillarious)
Buenro-games: No one mentioned having watched the french film Martyrs Seriously, watch it, it's something else and I don't say it lightly.