I use KDE for my default WM. Yeah yea yea, I know, it's NOT geeky enough. I like it though, and Arch Linux moved KDE 4.1 from testing and it is now downloaded and installed on all my computers. Alot of cool new stuff in KDE 4.1 I applaud the Arch Linux devs and the KDE team.
If you haven't tried KDE 4.1 yet..... you should. It's pretty cool :)