Doom 3
HI ive been craving more doom 3 since i finished it and resurrection of evil a bit ago. even went as far as to install bfg edition to play lost mission and it was fine i guess, nowhere near as good as the original and RoE. a mod i'd recommend - it's not fully action horror, has a lot of neat storytelling and takes cues from classic doom (gameplay-wise mainly, doesn't intrude on doom 3's aesthetic) and amnesia: the dark descent, but i highly recommend you take a look at doom 3: phobos. would pay full price for it if it was for sale but it's a free mod
Left 4 Dead 1/2
been meaning to take a look at n-pack/nightmare and see if it really ramps this up. i do pretty fine in advanced but i am no good at expert difficulty at all so i have to wonder how it'd go. i also kind of hate the turtle rock survivor models compared to the final's but n-pack feels like it'd make them work