I like to think the DT770 Pro 250-Ohm is the safe choice, I think it sounds a little better then the 80-Ohm.
And I would assume with the 600-Ohm your pushing the sound cards amplifier to the maximum.
And usually the 600-Ohm version is only slightly better then the 250-Ohm version anyway.
Buy the 600-Ohm version when your ready to spend $250 or more for a tube headphone amplifier.




















