one best scary ( survival horror ) game you ( I mean all of you ) must try is Call of Cthulhu: Dark Corners of the Earth - this game is way more scary than any other survival horror game in FPS style and in this game you have fight ( not run and gun style ) real tight, keep your strategies right, flee away when necessary, always keep handful of supplies, make sure you close all the doors behind you and stay out of the sight of your enemies as much as possible.
Try this out asap - you guys will love this one.