Hardware looks like it could be good. The mention of House of Wax reminds me that I have to watch that. I believe Price is in that, and any of his movies tend to work for Halloween season. His Dr. Phibes films are great, too (they should remake those, they're sort of like Saw).
Here's my contribution to the marathon. I just recently watched The Final Girls. Very fun film, and I thought it was appropriate for Halloween (although it is more a fantasy film than horror, in a sense; if you see it, you will know what I mean). Good atmosphere, and a surprisingly good story attached to it, one that has a bit of depth. Check out the trailer if you are not familiar (it came out this year, and it features the guy from HBO's Silicon Valley, Thomas Middleditch). Anyone who remembers the TV series Weird Science will note that there was an episode that had the same concept (which is fine, of course, just thought I would mention that since that episode was the first thing I thought of when I saw the trailer for this project). Definitely not a perfect movie, it doesn't have the biggest budget (from what I could tell, although it did have something of a budget, to be certain), but it might be appealing to some.