Windowmaker, KDE or something else?

Hello SuSE folkz, In our eng.dept. we're looking to standardize on a single uniform Linux graphical environment. Could somebody please give me an advise what is more convenient to use with less system resources consumption? KDE is a very good environment but it uses a lot of memory and processor power. Windowmaker less resource consuming, has a nice interface, but we couldn't make its sound server working. CDE is severely outdated. What else we can take into consideration? We don't need a very generic graphical environment 'cause most of our engineers came from Winblows environment. Thanks in advance. Alex