I have been very frustrated: really wanted to suggest Montale or Ungaretti, but I got so disheartened in reading the translations, that it just won't do. You will have to learn Italian :-)
So coming back to English, I will nominate another poet who also had to work to earn his keep,
Philip Larkin. He is crude, but oh so effective! The
Collected poems would be good, but to keep it manageable I'd suggest
High Windows - a couple of the poems are available at the Poetry Foundation, otherwise it is available at
Amazon uk,
Amazon US, and couponable on
Kobo.
I will third Wallace Stevens.