I am new to the audiophile world and don't know that much about equipment and sound properties yet. I currently have the Mr Speakers Aeon Flow Closed headphones, HeadAmp Gilmore Lite mk2 amp, and Cambridge Audio DacMagic Plus DAC. I am looking for a pair of headphones and an amp that excel at the things my current equipment isn't so good at. Something good for progressive metal would be great since I listen to a lot of that. I listen to all kinds of genres (rock, metal, pop, hip-hop, rap, jazz, ambient, electronic, classical, etc... basically everything but country) so I'm trying to fill in the gaps that my current equipment have. My budget is ~$800 for the headphones and ~$500 for the amp, although my budget is flexible. I can also get more equipment in the future if needed to cover all those genres.