I've been using the I3 window manager with Xubuntu for over a year now and have really grown to like it. Definitely worth checking on if your looking for a keyboard driven WM. http://i3wm.org
I had a look at a bunch of other wm's and some common themes I found were that configuration files were in a programming language and documentation was "the mailing list and irc". If I had to learn a new language or have an irc chat room open for every piece of software on my machine, I would never get anything done.