I need new headphones the left side of my dt990's has died after like 6 years, i just have a basic setup atm with a fiio10. I'm looking to step up some with a 600$ budget not sure what i could get with that, i was thinking of the HD6xx but i don't really know much about dac/amps and thats why im here. I've only used all in one dac/amps so im not sure what type of wires i would need if i bought a seperate dac/amp or if they come with it and what ill need to power the headphones. Any recommendations are appreciated, i listen to a wide variety of music from rock to chill/ instrumental and multiple other genres