I am almost decided on getting Audioquest Dragonfly with HM5. I want to hear more musicality from them as they are a bit cold and boring for my taste (I have listened very few HP including: ATH-A500X and ATH-M50; I loved A500X, especially how comfortable they are). I hope Dragonfly is gonna work well with them, cuz ~250$ is the very most I can spend on DAC/AMP. I also want to get Shure velour pads and cable if possible. That would squeeze most of what HM5 can give you I think.
I think it is useful to say that I listen to ambient music: Brian Eno as the favorite artist, I also like soundtracks of Angelo Badalamenti and I love Jazz/Soul music: Nina Simone as one of the favorite artist.
Maybe I should start looking for another pair of HP because HM5 won't fit this kind of music or just make a more sober conclusion after pairing them with Dragonfly? (-:
I heard a lot of nice words about German Maestro GMP 400 as they have a beautiful musical sound. But they are 300Ohm, so I worry if Dragonfly AMP could handle them.
I have not heard the Dragonfly but I find that the Fiio E11 with the bass bost on 1 makes the HM5 a lot more fun. I also find them to work well with the Nuforce udac2, I actully enjoy them most with the udac2 feeding the E11 from the rca out. I don't like them at all through my Little Dot 1+.