Hey, @Stefan, since you saved my day (well, multiple days) together with @tobika, I think I owe you. So, here’s my two cents on headphones:
I chose none of the options above,since I am still in the process of decision. This sometimes takes longer when there is no good alternative. I tried many headsets. They are all not what I am looking for. Thus, I keep using some rather cheap cabled headphones sitting in the drawers, which one by one die after some time. Hell, I even killed my old Game Boy headphones, which I thought to be indestructable! (Washing machine accident. Shit.)
My current favourite is a Sennheiser Momentum on-ear (with cable). Which does, however, not work with my Fairphone. The connector does not fit with the original FP case, which I until now refused to cut open, since the USB connector opening and the headphone opening are too close together to do this without further damage. BTW, I am still annoyed by this design flaw, and blame it on A’Hong. Also, and even more important, the cable remote does not work with VLC. I tried that in an electronics shop, and was really surprised. I suggest you try it yourself, and see if this is just a problem in my FP1, or a general problem.
That said, if I had to choose an in-ear model, I would order a Shure SE215-K plus remote control cable (Important! Otherwise, again, the jack would not fit with the FP1 original cover. I tried with the standard connector!). The person who recommended them worked at the Fraunhofer Institute for Digital Media Technology and did audio testing on their equipment. (Which is one of the top spots in Europe to do that. I am still sad I didn’t have the chance to try out their test setup myself. Damn! 
) The recommender convinced me that the audio quality of the SE215-K is really good; nearly analytic exept for a slighly too strong bass. Great for electro, even more so for my Beatles-flacs. Šostakovič, J.S. Bach, Bartok and colleagues suffer a little. But for me, it’s really OK. 
The price is good for the build quality, and the friend who let me try shared his little secret and told me that if you order them from Canada, you can save a lot of money. BTW, the cable goes up and behind your ear. This feels really akward at first, but I got used to it.
The only reason why I refrained from buying them is that they are isolating against ambient noise all too well. This is great if you are commuting by train, @Stefan. However, I used to commute by bike, and would like to do so again. I will thus need an option which is a bit more flexible. With on-ears, I could also put them on slightly “wrong” to get some ambient sound in, and don’t get hit by a car, or other bikers.
All that said, I originally wanted to have a bluetooth headset again. I used to have a Motorola S805 bluetooth on-ear headset, which was quite good. The battery died shortly after I got my FP1 in Jan.2014, and I tried for more than half a year to repair it. I ordered spare parts from several sources. Repairability is not as bad as expected - however, the bloody thing does not turn on any more. I have no idea why, the batteries I tried had the right specs. If anyone want’s to give it a shot, I would give it away. It apparently used quite good drivers; the sound when cabled was really good. Of course, BT resulted in a loss of quality, but I am not a real audiophile. (A real audiophile would never use BT, but then, they also use bamboo condensors and suchalike. ROTFL.)
All new BT headphones I looked at were either to expensive, to shabby, or even both. Also, the FP1 (and, as far as I see, probably also the FP2) do not support APT-X. Which is a real shame, since in my experience this really improved the audio experience. Even for me, and I am really no audiophile. Some of my friends are.
So, catch-22. 
I can recommend the SE-215K. I am tempted by the Sennheiser. But I still haven’t found a pair which would fit my needs, and is more or less affordable.
