Not sure if you've started it already (judging from your list), but Origination is where it is at for Aria; personally I think it has some of the best single episodes in anime.
Speaking of good anime, I need to watch Planetes and Ima, Soko ni Iru Boku
From what I can see you don't seem to read manga, but I would suggest you to give Sangatsu no Lion a read; it's also by Umino Chica (Creator of H&C), and it's also one of my favourites.
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Speaking of good anime, I need to watch Planetes and Ima, Soko ni Iru Boku