KDE
Gnome
Others
I wanted to stick with an Ubuntu derivative if possible as this opens access to the widest range of pre-built packages, but, if I want to be able to ship a KDE desktop in future, it'll probably need to be a more polished distro than Kubuntu.
So I have to weigh the various pros and cons of Ubuntu, with its polish and Gnome desktop, or some other distro with a hopefully polished KDE desktop.
I've heard many good things about Mint, but until now have been too lasy to try it out, but that's about to change. It might just be what the doctor ordered.