I like "Synaptic Self: How Our Brains Become Who We Are" by Joseph Ledoux. It's less pop science and gets into some detail about how our neurons work at the cellular level. He's not afraid to use doodles to communicate ideas and I found the whole thing a really pleasant read as a neuroscience undergraduate student. The only thing worth noting is it's from 2002, so it's drawing on older research and examples from the field.