Hello, I am in quest for best headphone and amp for about 500$. I listen to dark ambient (Lustmord, raison d’etre & …), drone ambient (Thomas Köner & …) & noise music (Merzbow, K2 & …) in FLAC. I will get a Focusrite saffire pro 14 that people says has a good DAC & is a great audio interface too, so I think I don’t need a DAC (?). After many hours of research I have come to four choices (I have no experince with none of the aforementioned headphones and all of pros and cons are found here on head-fi): 1.AKG K 701 Pros:Great soundstage, Detailed Cons:Bass anemic, ” These are very very hard to drive and you usually need to spend more than 5 times the cost of the headphone to even get adequate amplification out of the headphone” 2. Beyerdynamic Dt880 250Ohms Pros:Neutral, Detailed Cons:a little bit bass anemic, treblish 3. Sennheiser HD598 Pros:Good sound Cons:Overpriced, not detailed and neutral as others 4. Sennheiser HD600 Pros:Great sound Cons:So much pricy, Not as neutral as others Now I need your help to choose between these four headphones and recommend me a great amp too. Thanks in advance.