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Mythotix
I recommend
The King of Elfland's Daughter by Lord Dunsany. A bit obscure since it's pretty old, but good.
I like most things by Patricia McKillip. She has a very fairy tale esthetic, without being at all pretentious. It's in no way her best work, but The Riddlemaster of Hed has a first chapter that left me gasping with laughter. My sense of humor is very Miss Manners though; I find her hilarious. Her Forgotten Beasts of Eld is beautiful.
If you like to think really hard, then try
Downbelow Station by C.J. Cherryh for space opera. A number of her books are set in this universe; Downbelow and the
Chanur series, which starts with Pride of Chanur, are both accessible and interesting. Cyteen also won a Hugo, but I just didn't find the plot as interesting. Her books typically have a very strong female protaganist with a male sidekick. I wouldn't really call her obscure, given her stature, but I think she's often overlooked.
For a less rigorous SF experience, I love Janet Kagan's Hellspark. I particularly love her concept of raising a baby robot AI. I forget the title of her book of short stories, but it was good too.
Jane Yolen has written some good SF/Fantasy. Cards of Grief and Sister Light/Sister Dark are my recommendations. She's also written a lot of children's books that I know little about.
He should in no way be obscure, but Bridge of Birds by Barry Hughart is near perfect.
I'll second Name of the Wind by Rothfuss. It edges into pretentious now and again, and I find it a bit clunky; nicely snarky characters though.
Detective Inspector Chen's beat in Liz Williams' books covers Heaven and Hell. He is partnered by a demon from Hell's Vice Department. The first book is Snake Agent, where he has to find out who is criminally diverting the souls of young girls to Hell instead of Heaven.
War for the Oaks by Emma Bull is one of the early Urban Fantasy books, before it was really its own subgenre.
Err, Zelazny isn't obscure either, but most people recommend his excellent Amber series; I'd add Lord of Light instead. Beware though, his work is either very good or very bad (I'm looking at you Jack of Shadows).
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AloRenzSilver The Kushiel books are luscious, with some of the best world building I've read; but it should come with warnings about the prevalence of masochism and sadism in the later two books. Some people would find them very disturbing, though they are integral to the story.