Hard-Boiled is a great book, in my opinion, but I'm not sure if it's a great starter since it's also his most "sci-fi" book (if only loosely), and plot-driven so it might give you the wrong idea of his style. I'd suggest reading it if you're interested though. If you like it, Wild Sheep Chase, Wind-Up Bird Chronicle, and Dance, Dance, Dance are the most similar in style. Well, technically 1Q84 might be the most similar, but personally that book fell flat for me.
edit: I suck at quoting