Couldn't agree more about KDE Plasma desktop. I've used most desktops there are and switched to KDE Plasma about a year ago (I used GNOME2 until then, don't like GNOME3 and Unity at all) and boy, KDE Plasma is by far the best desktop I have ever used. Looks great, has awesome usability (once you get used to it) and it is very flexible so you can adapt it almost perfectly to the way you work. Realy awesome.