If you're into subtle horror, you might like
Let the Right One In. It's about a little boy who makes friends with a girl about his age who lives in his building. Except she's not a little girl, she's a 600-year-old vampire, but he obviously doesn't know this. The 2008 Swedish-language film is much better than the 2010 English-language remake (titled "Let Me In") so if you're going digital and you can't find a copy with subtitles,
download the .srt file, but you have to get one that matches the source, else it'll be out of sync. If you use VLC Player you can adjust the sync to make the match pretty closely, if not perfectly.
Going old achool, if you've never seen
Freaks (B&W, 1932), it holds up well and IMHO is worth a look.
If you are into SciFi horror (with the occasional laugh thrown in) and can stomach Don Johnson, check out
A Boy and His Dog. It's far less wholesome than the title makes it sound. It's about a horny young man living in a post-apocalyptic world who partners with a telephathic dog that can sniff out pussy.
If you haven't seen Vincent Price's original
The Fly (1958), that might be worth a look. It's a little corny by modern standards, and you probably know the storyline, but if you haven't seen Vincent Price's interpretation, you've only seen immitations. It's told like a Film Noir (or Citizen Kane, for that matter), it starts by presenting the ending and then tells the story of how it got there.
Other little known 'gems' or older classics that have fallen out of fashion, The Babadook (2014), The Changeling (1980), Then Hunger (1983, w/David Bowie), Hell Raiser (1987), Phantasm (1979), One Hour Photo (2002, w/Robin Williams!!)
If you have a 'thing' for Scarlett Johansson, DO NOT watch
Under the Skin. Yes, it's probably the only nude role she will ever do, but you don't want your fantasy spoiled. And that's all I have to say on that matter.
The original Predator was a twofer, it starts out as a good war movie and ends up a SciFi thriller. That was one of the first Hollyweird movies I saw that had a fairly realistic depiction of small unit tactics.
Stanley Kubrick nearly drove Shelley Duvall insane. He had the entire cast and crew avoid her, and if they had to interact they were told to be nasty to her. So by the time they started shooting the scenes where she was supposed to look frazzled, she wasn't acting, she's on her last nerve because they'd skull-fucked her.
Horrendous.
IMHO, Saw and Hostel are part of this 'modern' tendency to voyeurism. The storyline is secondary to the graphic torture (good writers are expensive and 'shock' is cheap). The Pit and the Pendulum, only without Poe's gift for drama. Reminds me of a Japanese art film (the name of which escapes me) about a hot young thing who lets a middle-aged man pick her up and take her home. Then she drugs him and proceeds to tie him up, let him awake, then cheerfully dismembers him (in graphic detail) with a wire survival saw. The storyline wasn't unlike
Hard Candy, but the violence wasn't 'implied.'
I absolutely despise this rash of formulaic vampire/zombie/dystopian films we're in the midst of now. And they can't come up with new ideas, they just keep recycling old films. And most of the remakes are unmitigated shyte.