SUMMER OF NIGHT sounds good ... I like the theme of IT, so this one could be a fun ride too. I feel it's stupid the way some people compare them to each other, like if fiction on similar themes is some sort of competion where you have to draw a "winner".
GHOST STORY - first time I have heard of a novel that caused a geniue scarequit! I remember having read THE TALISMAN which Peter Straub co-wrote with Stephen King. That one was quite good.
NIGHTLAND sounds bat-shit insane, but it's in the public domain, so instant download. It was far more easy to get into than I had expected, maybe because it gets right to the action. I found a Blackletter font which fits its vintage writing style:
http://unifraktur.sourceforge.net/maguntia.html
(It is hard to find a good Blackletter font - most don't look the slightest authentic. But I think this is one of the better ones)
17th century writing ... isn't the first letter of the nouns supposed to be capitalized?
Some suggestions of my own:
I liked Koji Suzuki's RING, the novel addapted into that japanese horror movie, this being the sole reason for me to read it. The book and the film follows roughly the same track, but there are some more depth to the story and the books most insane character are almost written out of the movie, for obvious reasons. And the main character is a guy. But beware that the book isn't scary - it reads more like a supernatural whodunnit. The novel was followed by SPIRAL and LOOP which takes the story to even more outlandish extremes. The author continued with even more stories, which I haven't read.
Koji Auzuki has also written the short story collection DARK WATER, which was addopted into the movie of the same name. The stories are not straight horror, but I remember them as mostly kinda gothic and water-themed.
Something which really got to me was the 1953 short story 'BLOT EN DRENGESTREG' by Villy Sørensen. Think torture porn, but with kiddies.
WHAT THE MAID SAW: EIGHT PSYCHIC TALES by Yasutaka Tsutsui - this is a short story collection centered on a maid whose mindreading brings trouble whereever she is employed. Not a scarefeast but pretty gothic, with focus on psychology.