I am a new poster here, however I have been using these forums for research for quite a while. And recently due to the praise they have received on here, I have purchased a pair of DT880/600ohm headphones. Now I am searching for a desktop amp to power them. Currently my set up is the following: Xonar DX (ASIO) > SPDIF > Denon Avr-590 receiver > HP out. I have been researching and reading reviews and opinions for different amps, and the new that constantly keep appearing are Little Dot MK IV, Schiit Valhalla, and WA3. (The Schiit Asgard seems to be also highly regarded). I have also seen in this thread that the Bottlehead Crack is a good amp, however it is a DIY kit which I am not so enthusiastic about. This is my first foray into higher end audio, and therefore wanted to get some feedback on which amp would be the better choice. The music I mostly listen to is metal, but recently have started exploring the electronic scene, and sometimes listen to classical as well.