Each of these I have liked well enough to memorize, which is about as high a recommendation as I can possibly give for sort-to-medium length poetry. Roughly descending order of how much I like them.

Other Lives And Dimensions And Finally A Love Poem, Bob Hicock

Dirge without Music, Edna St. Vincent Millay

Invictus, William Ernest Henley

I-5, aleashurmantine.tumblr.com

A blade of grass, Brian Patten

Rhapsody on a Windy Night, TS Eliot

Evolution, Langdon Smith

untitled, vd This is in my notes as being by 'vd', who per this I assume is this person, though I can no longer find the original.

Also, The Raven (Edgar Allan Poe) is somewhat longer, but is absolutely worth it. Read it aloud. Even if you think you have read it and not particularly been caught by it, go back and read a couple of stanzas aloud before giving up on it entirely. He does some of the best things with words of anyone I've ever read. "And the silken sad uncertain rustling of each purple curtain..."

Most of these links I've added to archive.is (see here ), so if any of these links are dead and Google is proving inadequate, check there.