There is not really a book missing from the list in the first post that I would consider "absolutely must read".
You will probably benefit the most from tsumego (both hard and easy and on different topics - life and death, endgame, tesuji) and analyzing your own games (on your own, with your opponent or with a teacher).
As far as tsumego there are really plenty of them available everywhere.
I can recommend you the following books:
http://senseis.xmp.net/?200EndgameProbl ... ingTacticshttp://senseis.xmp.net/?200TesujiProblemsKnownAtAGlance(very well done books, I loved to go though them).
http://senseis.xmp.net/?AllAboutLifeAndDeathIf you want a really thorough understanding of corner shapes. He never tells you upfront what the solution for the diagram is, maybe its ko, maybe seki, maybe to live unconditionally - you will always have to figure it out.
http://senseis.xmp.net/?LifeAndDeathInt ... elProblemsA very good tsumego book, from the God of Tsumego himself.
Best of Kido 2: The Ins and Outs of Life and Death
http://www.hebsacker-verlag.de/best-of- ... -4646.htmlIf you want some really tough ones - the problems are aimed at 2-3kyu (1 star), 1-2dan (2 star) and go up to 5 stars. I looked into the problems and got some of them right, sometimes I found the key move but didn't cover all variations or got the moveorder wrong.
If you enjoy commented pro games I recommend you all of Zhou Yuan's Books, especially 'Learning from Pro Games'. He understands how to explain playing styles and reasons behind pro moves to players below dan level. 'Learning from Pro Games' is his newest book and contains two old chinese games, which are of superb quality.
And you can't bring up books of commented pro games without mentioning John Fairbairn! 'The go consultants' is a one of a kind!
http://www.hebsacker-verlag.de/the-go-c ... -3208.html