Hello! I just finished my undergraduate quantum mechanics education and am looking to self-study the next level some time soon (after finals!). We used Gasiorowicz in my class: a god-awful pedagogical text in my opinion. Though I've done pretty well in my course (I'm fairly certain I have an A), I feel like my understanding is severely lacking. What I'm looking for is a more in-depth treatment of quantum mechanics which spends a considerable amount of time on the mathematical formalism. Honestly, the math in quantum mechanics was way beyond anything we've learned at the undergraduate level, in my opinion. A bunch of hand-waving was used, and while I can solve quantum mechanics problems to a degree that my professor feels I'm worthy of an A, I'm afraid all I've learned are rules for symbolic manipulation without any real understanding of why those symbols are being manipulated as they are (for example: solving a differential equation involving operators). I've heard Sakurai and/or Shankar are the next logical steps. Any input from you guys would be appreciated.