I think the main issue here is the output impedance of the headphone socket from your amp. If it's high, you're better off with headphones that have a flat impedance curve so that the overall tonal balance isn't affected. Usually this means a planar headphone from the likes of Audeze or Dan Clark Audio.
Headphones Newbie; Senheisser HD 800s or Focal MG Clear
Hi
I'm currently down to one pair of speakers, Quad 2905's. And because these speakers are with the repair technician on a continual basis, I need a backup. While another pair of Quads or another brand of speakers would be ideal, I don't have that kind of money at the moment. So I've been thinking about buying a pair of headphones that punch above their weight class. My local Senheisser dealer says the HD800s and my Focal dealer says the MG Clear. I really like the looks of the Focal's and am leaning in that direction. I'll just use the headphone input on my ASR Emitter Exclusive II. All suggestions are appreciated, thank you!