Some FPS Horror game suggestions?

I grew up always watching my grand father play horror games but never really played them myself. Lately I've had a massive itch to play a really good FPS horror game and was hoping the people of Giant Bomb could help me out because I really can't remember the name of any that I've seen. PC is the preferable platform (GOG and/or Steam versions would be nice) but Xbox is fine as well. Bonus points if the game is set in space. I already know about the Fear franchise so no need to suggest that.

DOOM 3

System Shock 2 ^___^

Fear 1 is pretty good.

@ezakael: Condemned, STALKER (get the complete mod it is great)

Amnesia is the right answer.

amnesia, and slender, and slender the arrival

This is true. Amnesia has always intrigued me though so perhaps I will check it out at some point.

Cryostasis Cryostasis Cryostasis!

I will never stop singing that game's praises.

In fact, I'm about to get a new PC. Time to go play Cryostasis minus the bad FPS. Probably STALKER too!

Man, people have already thrown a lot of great ideas out there. Er... Call of Cthulhu: Dark Corners of the Earth is all sorts of awesome.