Hasbrouck

I bought a pocket sized PB 6510 R-30 for 27€ a little while back. It has been great. Especially great value.  The place I bought it from has a lot of pb swiss on clearance and I bought about 30 different pb swiss drivers for home and work. They seemed like they had been sitting in a warehouse for a long time (little bit of dust and surface rust on a few) looking at the other products they carry its the only high end brand on the site so their usual customers probably didn't go for them and they finally just want to get rid of them. I just checked and they still have a few things in stock. 
https://aurymat.com/produto/chave-pontas-com-roquete-pb-6510-r-30-swisstools/

Just want to point out for the pb swiss ratchet comes in 2 versions (+ a few more sizes)

PB 6510 R-100
and

PB 8510 R-100
also the pricing is quite different in EU The PB 8510 R-100 with no bits can be had for under 60 euros(with 20 bits its 100 euros) and the PB Swiss Tools  6510.R-100 with 10 bits can be had for under 75 euros
This could make it a better option for some people in EU due to shipping from LTT store
 

I second the k712 as long as you have the space around your head. They are bulky so may not work well in a hammock for instance. They are however very light and comfortable and sound amazing. Great sound stage which is nice for music but even better for gaming. I personally use them mostly for gaming and listening to music at my desk at home. They also have decent frequency response at low volumes in case you need to turn it down to keep an ear out for something. The only other downside I've run into is the long ridged plug from the cord coming down can bump my shoulder if I move certain ways. If you switch directions and decide on closed back I have really enjoyed my AT M50s with aftermarket Brainwaves sheepskin and memory foam ear cups. That combination fixes the sweaty stiffness of the stock ear cups for a really comfortable and great sounding setup.