I would suggest that you check out the........ Yamaha HPH-MP220
the ...........Philips Fidelio X1
also the ...........Sony MDR MA900
these 3 are unique.
If you are reviewing the industry websites then there is a lot of praise for the B&W P7, the Sennheiser Momentum, the KEF M500, and the PSB M4U1.
Ive owned all those, including the HIFI Man HE-400s (which sound very good, kinda dark).
Ive also owned Beyer DT 150s, and DT770s and DT880s, and German Maestro 435s, and AKG 712 and 702 Anniversary and standard 702s and K-551s.
I own also Senn HD 600s and Focal Spirit One and Spirit Pro.
Also in there are Think Sound ON1, and Bang & Olufsen BeoPlay H6, and NAD Viso HP50s.
The best of all those are the :
1.) (incredibly articulate tho quite natural sounding ) YAMAHA HPH - MP220
2.) the (indefinable and sonically unique) Philips Fidelio X1
3.) (sadly overlooked natural sounding ) Sony MDR MA900
Would you still rate the X1's above the HE-400 if you get them with the velour pads (which is said to give it a brighter signature)? I'm getting a new pair of headphones and I'm not sure if I'm going with X1, HE-400, Fidelio L2 or 650. I have a Audinst MX-1 to power them with.