You left out the "Ring" game on the Dreamcast. I know it sucks, but you put many other suck-*** games on that list.
It's really ashame that you haven't played two games that I found absolutely frightening. "Siren" for the PS2, which is probably the hardest game I've ever played in my life. And "Call of Cthulhu: Dark Corners of the Earth" for the XBOX, which is such a surprisingly good game, and also pretty danged hard. Both of those would be nice to go with this Halloween special. Additionally, I think it might be a good idea to play "Condemned: Criminal Origins", and add that as your only entry in the XBOX 360 section.