All the movies of above and their sequels / remakes are very good indeed. For the horror fans I have to say though they the above titles represent actually more movies, as it follows:

The Grudge: it started actually with the Japanese movie Ju-on: The Grudge (2002), followed by Ju-On: The Grudge 2 (2003). These movies were followed by a Hollywood remake: The Grudge (2004), along with its sequels - The Grudge 2 (2006) and The Grudge 3 (2009). Another remake was launched on January 3rd, 2020, named also The Grudge.

The Ring: it also started with a Japanese movie, named Ringu (1998). This movie had a sequel - Ringu 2 (1999). The idea was taken then by Hollywood, which launched The Ring (2002) and The Ring Two (2005). The last part of this sequel - Rings (also known as The Ring 3) - was launched in 2017.

Poltergeist: this is another great horror movie, launched in 1982. A remake of this movie was launched in 2015.

I'd suggest to watch all of the above movies, including the Japanese versions. They'll worth your while