I know it's a bit late, but no one asked for your opinion anyway!
But seriously, DAT MOD, I stumbled across this one on the Steam forums and fell in love. Built on the source engine and more to the point, modded for Half Life 2: Episode 2, Nightmare is primed with enough horror and jumps to have you crying to sleep for days.
I had already played through the mod proper, but not the prologue. so, for your amusement and at my expense, I elected to record it and make a quick let's play of the horrors inside of this piss-your-pants-tastic house.
I couldn't recommend this one any more, It's free and link-able to steam.

You can find the mod here: http://nh2.wecreatestuff.com/

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Be sure to share my horrified screams with your friends!