Kuyper's Lectures on Calvinism will be a fun read. I've been teaching through it to our adult Sunday School class for the last few months. A book that I've found very helpful is Peter Heslam's Creating a Christian Worldview: Kuyper's Lectures on Calvinism. It contains a lot of excerpts from his other writings as well as background information. The sketch of his life is also excellent. I disagree with his analysis on a few minor points but definitely worth picking up if you can find one at a reasonable price.