100%
for me, the holy trinity is Le Guin, P.K. Dick, and Jack Vance. The first book I would recommend to new readers of each would be Le Guin's 'Four Paths to Forgiveness', Dick's 'Ubik', and Vance's 'Ports of Call' (or Suldrun's Garden if fantasy is allowed).
For unheralded books, I think...