Had an e7, battery did not charge. returned e10. Feedback/buzzing noises issues. I'm going to be returning the e10 back to amazon, when my new DAC comes in but i have yet to decide that, so any recommendations around the 100 dollar area? I just need something to plug into my laptop and currently using m50's so I don't really need an amp, but it would be nice to have one if i ever get better stuff that needs more power. But will amping m50's lessen the quality? Anyways, anything good around 100 bucks NOT from Fiio? So far I've only seen reviews on the D-zero and Udac-2.