Recs.
Updated
Xubuntu is a community-maintained derivative of the Ubuntu operating system using Xfce desktop environment, instead of Ubuntu's Unity.
SpecsUpdate
Pros
Pro Customizable
Official distro of XFCE, one of the most customizable desktop environments. In XFCE you can create as many tasks bars as you need and configure every one of their elements and behaviours. You can also change any icon, font, color, etc. There's literally nothing you can't change in GUI.
Cons
Con XFCE development is slow
The desktop environment used in Xubuntu has not been updated in over two years and is developed at a snail's pace.
Con Redundant
There is absolutely no reason to install it, since it uses the same package repositories as Ubuntu and you can transform any Ubuntu install into a Xubuntu install.
Recommendations
Comments
Flagged Pros + Cons
Pro Conservative, yet modern
It comes with all Ubuntu goodness but without bloat, a perfect mix between new ideas and usability.