I don't care too much for KDE or GNOME. Too bloated. I have better things for my cpu cycles and memory
At this very moment
I'm using IceWM. I like the fact that you can make a double-size taskbar which includes shortcuts to applications, cpu and net monitors, a box to type in a command line to launch apps, among other things.
I also like fluxbox, WindowMaker, fvwm, xfce, ... There are so many good choices, it's best to try them all!