I <3 my Xfce.
Hm, the move to Gtk3 is sad news… It means crappy themes and broken scrollbars.
Also Thunar 1.4 is better than 1.6. The new shortcuts pane wastes vertical space and the reload button is in the wrong place (à la Firefox).
GTK 3 has lots of great themes.
Such as Greybird, Zukini, Zukitwo, eGTK (elementary), etc.