Whats a really good thriller movie?

Try to watch the movie SAW 1-5, it's really a good thriller movie to watch..it will make you think. It's a surprisingly strong story that was full of twists and turns that would make any mystery fan happy, and a fairly solid cast of actors that didn’t consist of fresh-faced teenagers that barely have any acting experience. Watching “Saw” for a second time, I feel it was a much better horror movie than I initially believed it to be, and was also an adequate mystery thriller that set itself apart from most thriller/horror films by actually having a decent story and not relying on some supernatural killer, that for some unknown reason audiences are intrigued by, to propel the movie forward. In fact, you barely even see the killer in this movie, which is even more surprising for a thriller/horror film these days, having a modern thriller/horror film that actually leaves its killer shrouded in mystery is unheard of, and was very much appreciated here.