After having not the expected hassle-free feeling, I bravely installed Manjaro, a recommendation from Ralf (thanks).
After some hiccups, especially with encrypting the home dir, it works like a charm.
The hybrid Intel-nvidia-nouveau-bumblebee driver is kind of slow, unlike in Mint 17. I'm not sure why this is, and if I should use the non-free nvidia driver or not. But other than that it's great.
I will also write a complete article for this in the next days, to give you some hints on installing Manjaro. Now let's see how this will work in the future. Is this the time, where distribution upgrades are no more? Rolling release model. Always having the latest system running. Sound almost to good to be true.