Can I pick your collective brains please? I use Ety ER4P with custom sleeves as my daily driver via a Meier USB DAC amp (Corda 2Move) in the office, or directly into my phone when on the move. However it is becoming, literally, a pain in the ear to constantly remove them as I am interrupted at work. So I'm on the lookout for closed, over ear headphones, and had settled on the Beyerdynamic DT-770 Pro 250 Ohm. But what about the DT-1770? Hmmm. There is a 200 page DT-1770 thread which I'm wading through for opinions, but thought I'd ask here too. I'm happy to drop GBP 110 on the DT 770, but may need convincing to drop GBP 380 on the DT 1770. Are they worth the extra money? I love my Etys. Will I be equally happy with either of my Beyer choices or, given that the DT1770 are more in the price range of the Etys (GBP 300), is that where I should be looking to get the same level of performance? Any help, thoughts, guidance will be much appreciated. Thanks!