What is good cheap iem for HTC M8?

Can you guys give me some recommended best cheap iem ( <$25 ) for metal music such as Killswitch Engage, Trivium, Machine Head, A7x, Pantera and Dream Theatre?
i only have this device, and v4a installed...
Thanks

from xda-developers http://ift.tt/1X50aoP
via IFTTT