I am sold – there is no way I am going back! The LXDE is just amazing!
LXDE is a full desktop environment with OpenBox as window-manager. And believe me – it’s fast! My first run was under Xubuntu 8.04 on a Dell Latitude P4 1.8GHz 1GB ram. It handles Gnome, KDE, Xfce pretty well with its respective wm’s. Openbox is known to be fast, and with a minimalistic DE, I believe my choice is made!
LXDE is now in the official Debian repository. Just apt-get LXDE!