Clover feild was ok IMO - as long as you don't know what to expect. I watched it the first time thought it was fantastic but the second time wan't as great. I have always been a huge fan of horror movies (at least up until I realized RL is a horror movie) some of my faves were the Evil Dead/Army of Darkness and nightmare on elm street series. I recommend "They Live" john carpenter is always good ("the Thing" get EU cameo too right). V the series old version and new version. Case 39 is the scariest movie ever imo.
HELLRAISER 1-3 then stop cause the rest are not good. Just open the box and you will get a big surprise its gore so maybe not what you are looking for.
more modern is The Conjuring - that was a freaking scary movie!!! seriously don't fucking watch it !!!