I'll be traveling some this month, but I still will get to,
Dawn of the Dead
Invasion of the Body Snatchers
If I have more time, I'll watch Under the Skin or Black Swan. Which one is more Shocktober worthy?
Hmm. I consider both to qualify, but from the poll a few days ago, it seems that some people don't think of Under the Skin as horror. Black Swan is kind of like The Red Shoes meets Repulsion, so a psychological thriller that I think is horror-ish enough to count, whereas Under the Skin is more of a contemplative arthouse film with a horror mood... if the question is which is scarier, then I'd say Under the Skin, but YMMV.
On the Sandy scale of scariness, Dawn of the Dead would count as "Safe" I think, it's more of an adventure film and a parable, though obviously being a zombie film makes it a horror film. Body Snatchers though... some chilling stuff in there. I'm sure your reviews will be as unique and interesting as they always are.