The best of iconoclastic fantasy authors?

I am exploring fantasy books this year that hew more towards old-world fables, as opposed to post-Tolkien D&D-style world-building and complex magic systems. I'm more interested in unique tone, unique prose style, dreamlike worlds with a rich atmosphere, sharp fantasy writing with a lot of texture and personality, etc.

Here are the authors I've discovered so far in this search who I think are really special, really magical:

1. Jack Vance: specifically, his Lyonesse trilogy, which, written in the 80s, was a late-career high-fantasy that is distinct from the vast majority of his work (which was more in a pulp-sci-fi adventure vein). This is one of George RR Martin's favorite authors/books, and halfway through The Green Pearl now, I can see why. There are a number of elements of Lyonesse that seem to directly presage some of the things Martin would do with Game of Thrones, yet the style and tone is much different from Martin's, much more old-world and wry and high fantasy, less obsessed with sadism and being 'grimdark.' But it has twists and turns that give GoT a run for its money and the story is highly intelligent and difficult to predict. It's not for all tastes. The writing can be quite archaic, though it's also sharp and efficient and you know what's going on. The dialogue is amazingly inventive, and the world has tons of texture and richly imagined detail. I could go on and on about Lyonesse. Highly recommended, though you'll want your dictionary on hand. Very competent work that respects the reader's intelligence. I've heard that the Dying Earth series of books by Vance is also excellent, though a bit more sci-fi/fantasy.
2. Peter Beagle: Picked up The Last Unicorn on a whim in a thrift store because I liked the title and vintage cover art. Didn't expect much -- turned out to be amazing. Poetic and rich with melancholy, much more adult than I expected in overall tone. Dreamlike and powerful. It feels like a fable written by someone with a lot of emotional maturity, who has been through depression and hardship. Very impressive piece of work.
3. Mervyn Peake: I've yet to finish his Gormenghast trilogy, but Titus Groan was unlike any other fantasy book I've ever read, for sure, and I'm eager to get back into his world soon. He's not plot-driven -- you have to be into the idea of just settling into Gormenghast and its grotesque denizens and quirky characters for their own sake, and just enjoy the gorgeous prose and bizarre, unpredictable scenes. Singular and totally unlike your typical genre fantasy.

Here are some more authors who I have not yet read and cannot yet vouch for, but who have been put on my radar and seem potentially interesting:

• Michael Moorcock: I could see myself going either way on Moorcock, but I picked up Gloriana recently, which seemed the most likely to be up my alley.
• Patricia McKillip: I have high hopes for this author, my impression is that she's very atmospherically fairy-tale-ish and original. Recently grabbed several of her books on Amazon.
• Tanith Lee: Hard to find anything by her in print, and not sure if I'd like her, but I'm curious to try her out sometime and have one eye on her eBay listings.
• Gene Wolfe: Has been recommended to me a number of times now, though I'm told he can be a bit difficult to follow/understand. I tried Book of the New Sun as a teenager and it bounced off me at the time, but that was long ago and a much different period of my life, so I'm more than willing to give him a fresh shot.
• Clark Ashton Smith: I've read a few of his short stories and I liked them, generally. I don't think he has any big novels though.
• Hope Mirrlees: An older fantasy writer who wrote a quietly influential book called Lud-in-the-Mist. The physical copy currently in print is hot garbage btw, I bougt it and regretted it, it's just a printed PDF on cheap paper in like 4 pt. font with a hideous cover. I haven't read it yet, but I actually ended up spending an afternoon constructing my own eBook .pdf from the Gutenberg text, bc the one that was otherwise available was crappy -- if you want a free copy of this .PDF feel free to hmu for a link. It's fixed size but I have a version formatted for PC/tablet and another formatted for a phone screen.
• Lord Dunasy: Another older/early fantasy author who write The King of Elfland's Daughter. Have a copy of this one too, haven't read any of it yet.
• E.R. Eddison: Another much older author -- wrote The Worm Ouroboros. Haven't picked it up yet but seems like it could be interesting, I'm not certain.

So -- who else do you have to recommend that I'm missing, who you feel is highly original and off-the-beaten-path of the typical genre/world-building-oriented fantasy? Or, feel free to share any comments/thoughts you have on the authors I mention.