What is your preferred desktop environment?

When I decided to create Excelixis I had to choose the desktop environment it would use (and as a consequence the flavor of Ubuntu it would be based on). I chose Xubuntu because of XFWM and its stable compositing feature, but now Metacity has also matured and compositing is stable enough.
Also, one of the major drawbacks of Excelixis v1.0 (according to the e-mails I have received) is that it does not use Gnome. So, here is the question:

Poll Closed – Results:

Edit: This poll will go on until Wednesday December 10th 2008.