I strongly caution you AGAINST installing any other desktop flavour first if you want to use the KDE desktop.
I did this for my wife and have regretted it ever since. I started with Cinnamon, then tried to add mint-meta-kde, bad mistake, the only option I had that worked was to install kde-standard, then try to mint-ise it by adding packages that would be in the regular KDE version, however, not all were installable.
To name a couple of major irritations, the update manager icon in the kicker panel will fail to load and the only way to get it running is to log out of KDE and into Cinnamon. This is because it relies on gnome transport mechanisms and it uses only those, not the KDE ones. Another major issue is the time and date revert to UTC with NO way to change it from within KDE so that applications like emails etc will have the correct timestamp. We are in GMT +12, so all her emails arrive BEFORE the date and time they are sent.
If you want to use KDE, start with KDE and do not deviate from that path. You can install the mate or cinnamon desktop AFTER you have KDE installed and things will go well, but DO NOT start with anything modelled from or derived from the garden ornament "Gnome" because things are done very differently and there will be unsatisfiable inconsistencies throughout the system.
Just another word of caution though, sometimes the sources list of a fresh install KDE 14 gets mucked up, nadia is placed where quantal should be in the ubuntu lists, so watch that one. It's easy enough to find and replace all nadia's with quantal though.