I've done too many lists recently, so here is my official
"please read these authors and at least the majority of there works before expecting me to regard your recommendations or opinions about fantasy with any weight list"
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1. Mervyn Peake
2. M. John Harrison
3. Gene Wolfe
4. Fritz Leiber
5. Franz Kafka
6. Italo Calvino
7. Gabriel Garcia Marquez
8. Michael Moorcock
9. Mikhail Bulgakov
10. Jonathan Carroll
11. Edward Whittemore
12. China Mieville
13. Tim Powers
14. Michael Swanwick
15. Mary Gentle
16. Angela Carter
17. Robert E. Howard
18. JG Ballard
19. Ursula Leguin
20 Roger Zelazny
21. Brooks Hansen
22. Jorge Luis Borges
23. A.S. Byatt
24. Jeff VanderMeer
25. Jeffrey Ford
On the non-fantasy tip it would be nice to know Philip K. Dick, Arthur Machen, Ian. M Banks, and HP Lovecraft, and tons of othwr SF authors, because as much as some for some reason don't get it - it's all interconnected.
For my 101 list look -
HERE
For my extension of that list to 200 look
HERE