I did read the famous one from PKD but no others of his though I think I should. I've listened to Tom Luongo quite a bit, I like the guy and respect him and he is a very big fan of PKD. Which authors and specifically which books would you recommend?

edited to add (append-only style): Foundation series and Dune seem a bit daunting (they're very long right?). Should probably read Dune, at least the first one edited to add some more: I like the fact that massive spans of time are covered / narrated in the Foundation series. Dune as well but maybe not to the same extent but still a large swath of time iirc (from reading or hearing stuff about the books) adding some more: I remember reading the Nexus series by Ramez Naam. Some guest on some interview recommended that series. Or might have listened to podcasts with the author. Might have been Singularity one-on-one. I seem to remember liking those and the way they were written.