I have found that a good book at an intermediate level is:
- Modern Quantum Mechanics, by JJ Sakurai.
It has modern notation, plenty of applications, and enough detail to be able to follow through self-study if you know basic undergraduate quantum mechanics (at the level of David Griffith's book, for example).
If that material is too basic for you, then another, more advanced (though older), book by the same author is:
- Advanced Quantum Mechanics, by JJ Sakurai.
This includes some QFT applications.
A quick Google seems to suggest that PDFs of both books are available on the web.