Book recommendation for the experienced player

[pyroponic]

Hello, I play $5/10 6-max and i'm going to be moving up to $10/20 6-max in the near future, so I am looking for books that deal specifically with middle limit and advanced play. My friend recommend King Yao's "Weighing the Odds," and I need another book so I can get free shipping =) If anyone can recommend one (or more if possible!) I would appreciate it.

I own the following books:

Theory of Poker
Small Stakes Hold'em
Hold'em for Advanced Players
Middle Limit Hold'em
Improve your Poker
Inside the Poker Mind
Psychology of Poker
Poker Essays I, II, and III