"Candidate" off Diamond Dogs is my favorite Bowie song ever. Go figure.
Man Who Sold the World, Ziggy, Diamond Dogs, Aladdin Sane, Hunky Dory top tier
Station to Station, Heroes, Low, Lodger second tier (still very good)
Space Oddity, Scary Monsters, Young Americans, Pin Ups, Let's Dance I've only heard some songs from. None has quite moved me to listen to all of it. Anything newer might have a couple of good songs (I own Earthling, somehow).
I found that the songs off Changes___Bowie were good guides to the records overall. Ziggy, Diamond Dogs and Aladdin Sane are the full-on concept albums, but most of his stuff at least has themes running through it.