I've personally never read any book from the most well known atheist personalities, to my greatest unhappiness, but I'm looking forward to it. I've however seen various youtube videos/documentaries and I prefer Richard Dawkins the most. Perhaps the british accent makes his arguments sound better, or he is just more appealing to me, but I love seeing him crushing theists on debates. Sounds like a nice guy to meet in real life.
Whoever fights monsters should see to it that in the process he does not become a monster. And if you gaze long enough into an abyss, the abyss will gaze back into you