My Senn HD-280s broke so I'm looking for a good portable amp to go with a pair of Denon AH-5000s and my Cowon A3. I don't know much about amps but could read if pointed in the right direction. My budget is around 100-200$. I mainly listen to Electronic, Ambient, Jazz, Downtempo, Classical, Indie Rock, and Classic Rock. Any help would be appreciated