The amazingly productive Stu at Winston’s Dad put together a list of lists Spanish language books, translated in English. See more here
El Mundo the best 25 books from Spanish 1989 (thanks Arcadia books for link their Blind sunflowers is on the List ,plus two books by Juan Marse that Maclehose is publishing soon .
Conversational reads has another list of 20 great books from Spanish .
Scauffi has a longer list here in Spanish a lot of Marquez on this one
The telegraph has ten best Latin american novel here ,Not all Spanish but mostly