[metternich1815]

I will miss The Thing (1982), but I agree with swapping out aliens for supernatural, Halloween really is not complete without supernatural. The original Haunting would be a good one. The others would be good too, personally I would go for two movies that are scarier, but those are not bad choices in any case (The Changeling, Paranormal Activity, The Blair Witch Project are a few off the top of my head). As for slashers, I love Psycho (which is really not a slasher), but if you have not seen Sleepaway Camp, I would say that would be good to replace it with. You really need to see Sleepaway Camp, it was really good.