I'll (hopefully) be starting a PhD program in hard condensed matter theory in fall 2018, and need to decide which courses to take this spring. I'm currently in the first semester of graduate quantum mechanics and would like to take the second semester (which covers relativistic qm, second quantization, and QED mostly), but it's being offered at the same time as many body physics, which I also want to take since it is relevant to my research interests. My concerns are that having taken many body physics would make it easier for me to get hired by a theory group as a grad student, but that I may lack some of the formal prerequisites for the course by skipping regular quantum mechanics. Nevertheless, I have some experience in the subject matter from outside reading and feel prepared to take it. Any advice you could give would be much appreciated.