I have around $100 dollars to spend and I'm looking to buy a portable USB powered DAC/amp combo. The headphones being used with this will be the Beyerdynamic DT 770 Pro 80ohm variant. I've been looking at a few, but I'm open to more suggestion thanks to anyone who helps out.   Current Options...

Hi, everyone, this is my first post on the forums I hope to hang out here quite a bit. Anyways I've been looking into picking up some headphones for around $150-$200 for music listening. In the past, I tried the Sennheiser HD 558's and the AKG K545's; however, I felt neither had enough bass. The...