Hi, I'm a quasi-lurker who's familiar with Beyond the Box Score mostly from Brew Crew Ball, and I've got a request for a recommendation from you.

My birthday's coming up, and I'd like to ask for a Bill James book, or some other seminal sabermetrics book. I'm familiar with most of the basics of sabermetrics - WAR, VORP, FIP, a little bit of defensive metrics - and I love reading about the logic behind these statistics. After having read Moneyball and various bits of other sabermetric stuff, it seems to me that James was the best at expressing this.

I'm not really into the math side of things - more so the logic of "Why this makes sense as a way to measure baseball players, and what these metrics shows us about them." And I guess I'm looking for something a bit beyond entry-level, but not exactly hyper-advanced. Any suggestions of good, foundational sabermetrics books to read? Is there a particularly "must-read" Bill James book?

Thanks for any recommendations you have. I appreciate it.