It's around Halloween, so this is worth mentioning, too:
They've finally got around to releasing an updated version of the original System Shock. Now, System Shock 2 is one of my all-time favorites, but it's one of the usual suspects and you've probably checked it out anyway. The original, on the other hand, used to be quite funky when it comes to running the game on modern systems. They've collected various unofficial patches from the community, worked on them, and released System Shock: Enhanced Edition. It's the same old classic, but without clunky controls (now you can mouse-look) and with higher res support (1024x768 + scaling filters). Plus, you don't need DOSbox anymore, so the game runs smoothly!
Is it a horror game? Yeah, I guess. But not that much more so than AD&D games filled with ghouls, ghasts, zombies and whatnot. It's action-oriented, but all the fun comes from interactive exploration, as well as immersion provided by crew-member audio logs and one of the best nemesis-type character concepts ever.
First, check out the classic intro and a little bit of gameplay.
Then take a look at some config advice.
I don't recommend installing any addons other than the virtual midi. There's one which matches the text logs with audio, but I don't think it's how it was intended to be.
Both System Shock and the sequel are often on sale, so this is just a heads-up.