For me, I run XFCE with Xmonad as the WM. It's all sorts of awesome, letting me best use each of my screens. I've found it very customizable and awesome.
What are the things you're looking for in a desktop environment?
Basically what I want is Unity's task switcher (I know, everyone hates it, but for me it is almost exactly how I like it), KDE's system settings, and xfce's everything else (except Thunar; but using Nautilus under xfce is easy enough).
What are the things you're looking for in a desktop environment?