I'm a huge fan of A Nightmare on Elm Street (1984). I think it's the movie that got me into the horror genre more than any I had seen before. It made me laugh and it scared me at the same time; it also had a young Johnny Depp. Hard not to like something like that!
I've already included Nightmare on Elm Street in a previous year of 31 Days of Horror. My love for that movie led me to check out some others involving Freddy. The second one is unwatchable, but there are some that are still fun to watch. I liked Dream Warriors and I included that one in 31 Days of Horror last year.
I really enjoy New Nightmare! It's not really part of the Nightmare series because it's mainly connected with the first installment, instead of the series as a whole. It's different then other horror movies that I've watched before. It's filmed like it's a documentary, catching up with some of the actors during the 10 year anniversary of the release of the first Nightmare. However, all of that changes when Freddy becomes real and Heather Langenkamp has to fight him once again by being Nancy.