Well the lighter window managers like Fluxbox/Blackbox tend to be a little minimalistic, but they are very powerful, and with proper knowledge, they can be used to save some time and effort. You could also try others like IceWM or FVWM95, which provide a fast windows 95 like interface. Or you could choose the middle path and go for something like XFCE
Vignesh, yes, KDE is a desktop environment, which provides other extra features like icons, file manager, applications in addition to its window manager.