I just wanted to mention that I have been building a new box at work for fun. I am of course using my favorite distro gentoo but, the item of note is that I am using enlightenment 17. I was a e16 user "back in the day" but, ditched it for Window Maker when active development stalled. The new version offers many reasons to switch from your current WM.
From the website:
"E17 is a next generation window manager for UNIX operating systems. Based on the Enlightenment Foundation Libraries (EFL), E17 is much more than just another window manager - it's an ambitious and innovative project that aims to drive the development of graphical applications industry wide for several years to come. E17 has not been officially released, nor is it supported yet. It's currently in a pre-alpha status and is under heavy development."
It is defiantly pre-alpha and not for the faint of heart but, if you feel up to the challenge I recommend it.