<<Think of a world without these songs ; I rest my case!>> Nice list, Michael! But you can't list Jericho as a "post-Hejira" song, remember it debuted on Miles of Aisles. An outstanding song nonetheless; one of the most HONEST love songs ever written.
Like you say, it's strictly subjective, but I would also take exception to "Tax Free"...it may have it's interesting moments lyrically, but musically it's really not much. Try just humming the melodic line to yourself. It's hard to lump that one in with the challenging melodic canon that Joni has created. I would say it doesn't even hold a candle to the others on your list. (and coincidentally, it's not even Joni's melody, it's Klein's) Bob NP: The Marshall Tucker Band, "You Ain't Foolin' Me"