Fangoria released an update for 2012 of their top 100 horror movies of all time.
I do not agree with some of them (come on, that shit that is Blair Witch Project at 24?! Better than the original The Hills Have Eyes?! The Descent at 16?!) but it's a good starting point.
I missed only few of them and I saw some of them so many times ago so I'll hit them soon