Fluxbox is simple and configurable, two things that rarely go together this well. And it's also portable. I've been rewriting these files for six years, and I've run some version of them with fluxbox in maybe a dozen different distros.
I call this configuration Konqbox, because its always been centered on KDE applications, and now it incorporates Plasma Widgets into the mix. KDE filemanagers (and here I'll include the Folder View widget) bring the graphical capabilities of a full-fledged Desktop environment to any window manager, and fluxbox puts that capability under your complete control.