I currently have a Xonar DG but it doesn't play very nicely with my low impedance earbuds. I was just wondering what portable amp would be good for 16 Ohm IEMs and 64 Ohm headphones? Obviously something with breathing room would be good (i.e. I decide to get a 250 Ohm pair of headphones in the future or something). Any suggestions? More of a music question than games but I do both really.