I would also recommend The Seven Military Classics of Ancient China by Robert Sawyer as a Companion, it includes:
1) T’ai Kung’s Six Secret Teachings
2) The Methods of Ssu-ma
3) Sun-tzu’s Art of War
4) Wu-tzu
5) Wei Liao-tzu
6) Three Strategies of Huang Shih-kung
7) Questions and Replies between T'ang T’ai-tsung and Li Wei-kung
You kinda double up on some of the previous topics but it does aid in the knowledge for the Chinese way of War.
And Clausewitz and Moltke are pretty good...
The Seven Military Classics of Ancient China is on my bookshelf as well, and it is certainly what I would recommend.
Beat me to it.