I would second the Laird barron recommendation. His collection, The Imago Sequence, contains some first rate stories, the best of which (and one of the best I've read period) would be The Procession of the Black Sloth, perhaps in part because I have a familiarity with Hong Kong and the setting resonated with me quite strongly. It's also just damn well written and expertly developed with some genuinely creepy and horrific scenes.
Likewise second WH Pugmire.
Michael Cisco's work is well worth looking into. He's one of the most original horror fantasists around, I feel, with an hypnotising prose style and an incredibly fertile imagination. His short novel, The Divinity Student, is something of a classic, though his short stories (collected in Secret Hours) are equally mesmerizing, and their effect in such concentrated amounts can be almost overwhelming at times. The Ice Age of Dreams is a first-rate short story.
Mark Samuels is a relatively new author whose collection, The White Hands, is well worth tracking down. Very similar in prose style to Ligotti, though a tad more traditional in theme. Mannequins in Aspects of Terror is a great little piece, a subtle, restrained nightmare. He's only written (to my knowledge) a single novel which, whilst good, doesn't really compare to his shorter pieces. Samuels, like Ligotti, is a writer whose work translates better to the short story form.
I've not read as much as I'd like to by him, but Joel Lane is very good indeed. An afforable collection of his best short stories can be found in The Lost District, short sharp tales of urban alienation and moral decay.
I know you didn't want any King-esque works but I feel that Norman Partridge's Dark Harvest deserves a mention. Written entirely in an omniscient present tense POV, this dense, fiery little crackerjack of a book set entirely in a small midwest town on the eve of Halloween is tremendously entertaining and a genuine revelation. It certainly gave me a new appreciation for how effective this type of more mainstream horror fiction can be.
Rmasey Campbell still writes some fine work. I don't feel particularly qualified to speak on his earlier work, but I found his later novel, The Grin of the Dark, to be an eerie and disturbing piece, gradually (perhaps a little too gradually) building to a frenzied climax.
