Evil Dead's a good series for what you're doing. The first one is peak no-budget horror that hints at Sam Raimi's style. The second is why everyone remembers the name. The third is good stupid fun.

The Ring is plain horror. Bleak visuals, intense tone, flawless audio, fucked up a microgeneration. A+, would recommend. Heavily localized from a Japanese original in a way that feels... domestic. It's why movies like The Grudge got remade for Americans, but the only hint it's foreign was that it's not about real estate.

Might I encourage you to watch the scariest game never made? Or maybe a newer cult favorite? Its my opinion that first person game horror has surpassed film horror, if only because it requires you to be invested in surviving.

Film horror and game horror can both be compared to a roller coaster.

With film horror you ride the coaster and everything flows exactly as intended by the creator, it starts up, it climbs slowly, and drops accordingly to a set time. It’s beautiful, it works and everyone loves roller coasters.

With game horror, you have start it up, you make it climb slowly, and you push yourself past the drop. And all that metaphorical mumbo jumbo doesn’t even account for the survival aspect involved in most horror games, which often involve intense jump scares.