I was on a poster buying binge back when I was trying to put together my own home theater.
To the best of my knowledge:
Godzilla 2014 - 27x40 (One sided from allposters)
Faster - 27x40 (Original)
The Equalizer 27x40 (Original)
Pixels 27x40 (Original)
Dante's Peak 27x40 (Original)
Cowboys and Aliens 27x40 (Original)
Godzilla 1998 27x40 (Original)
Dawn of Justice 27x40 (Original)
The Dark Knight 27x40 (Original) still can't believe I got it.
Prometheus 27x40 (Original) still on the wall
Kong: Skull Island 27x40 (Original)
Knowing 27x40 (Original)
Poseidon 27x40 (Original)
Several others (all original) and I think also a War of the Worlds 2005 27x40 (Original) I had an original for Fellowship of the Ring. My cousin got it for free from the theater on opening night when the first movie came out. He gave it to me and, being a kid, I just pinned it to the wall and it was slowly destroyed over the years.
I also have some of the smaller poster like the IMAX size for TMNT, Avengers, Independence Day 2, and a few others. I have several of the 24x36 posters for S.O.A., Gears of War 4, DOOM, Black Ops 3, Jaws, Avengers, a Ledger's Joker sketch, a Harley Quinn sketch, and a few others. I still have 2 original posters for Halo 2 that I picked up back when it came out.
I've got the theater mylars for films like Civil War, Equalizer, Terminator Genisys, Jurassic World, Godzilla 2014 and like 4 others.
I have the large 4'x6' bus shelter posters for Godzilla 2014, World War Z, and Terminator Genisys. The Godzilla 2014 was one I hunted for a long time and cost me quite a bit. I plan to have it framed somehow next spring.