I have just finished my junior year as a physics undergraduate and I am looking for a mathematical physics textbook that will help me to learn about some of the more advanced areas of the subject. I have already gone through "Mathematical Methods for the Physical Sciences" by Mary Boas. I am considering buying Hassani's book and I would just like to hear some opinions on it before I spend the money. Is this book a good choice for my next text to read on the subject? I was also considering Arfken but Hassani seems to cover all the same topics plus additional ones. Any advice or suggestions is greatly appreciated.