KCRW. Their new music selection can be a bit narrow (their version of the top 40). Most of that I like, with a few that I just find grating. But what I find endearing about the station is when they do live up to their eclectic claim. That's where I first heard Oliver Nelson; their ventures into classical, jazz, TV soundtracks, 50's US pop music ETC push the right buttons.
Radio Paradise and KUSC are my other faves.