I like the Lambdin translation. Really short. You can read it in a couple minutes. Living words. Words to live by.
#2 is The Philosophy of Schopenhauer by Bryan Magee
Extraordinarily rich. Dense with insights and perceptions. It's like walking on a beach littered with jewels. Entire vistas and landscapes open themselves to me in Schopenhauer's presence.
If you want to unite Eastern and Western philosophy in your head, this is the book to read. Schopenhauer says in one of his notebooks: "I confess that I do not believe my teachings could ever have come about until the Upanishads, Plato and Kant were able simultaneously to cast their rays into one man's mind."
The sections on the aesthetic experience are a must-read if you're an artist.
Magee's book on Schopenhauer represents the current high-water mark of the Western philosophical tradition.
#3 is The Portable Jung edited by Joseph Campbell.
Available for free on archive.org. I think the process Jung calls individuation is as real and natural and dangerous a process as pupal emergence from the chrysalis in butterflies. There are many cauldrons one can fall into on the path and Jung has illuminated many of them for you.
“However, for the man who studies to gain insight, books and studies are merely rungs of the ladder on which he climbs to the summit of knowledge. As soon as a rung has raised him up one step, he leaves it behind. On the other hand, the many who study in order to fill their memory do not use the rungs of the ladder for climbing, but take them off and load themselves with them to take away, rejoicing at the increasing weight of the burden. They remain below forever, because they bear what should have bourne them.” - Arthur Schopenhauer