Tie between 2 and 3. The feeling of uneasiness and dread they convey is just great, like the game is whispering that "you're safe... but not for long!".
Bonus video! I've said this in another thread, but the main menu/character creation theme in Dark Souls really resembles the calmer save room themes from Resident Evil.
I always thought this sounded familiar!
I'm most nostalgic for CV(X) or 4 probably, but I chose 2 because I thought it fit too perfectly after listening to them all. It was very close between that and the original.