I just finished reading 'The Case Against Christianity' by Michael Martin. The book is around 250 pages long and covers topics such as the historicity of Jesus, the resurrection, the virgin birth, the second coming, the incarnation, Christian ethics, salvation by faith, divine command theory, the atonement and the philosophical basis of Christian belief. The two chapters I thought were the best were Chapter 3: 'The Resurrection' and Chapter 4: 'The Virgin Birth and the Second Coming', though the rest of the book was very good also.
Some of the chapters are quite jargon-laden, but if one is familiar with the technical terms used in logic then understanding the book won't be an issue. I think perhaps the best feature of this book is the philosophical and logical nature of many of the arguments against Christianity, as opposed to the scientific approach of Dawkins, or the 'bad for society' approach of Harris and Hitchens (I'm not saying this is the only trick up their sleeves, but it forms a large portion!). Having a different approach to the discussion I feel brings a breath of fresh air to a debate that all too often revolves around the same stale talking points.
I highly recommend that everyone reads this book, it's well worth your time.