Look for cans made by microphone mfrs, i.e., AKG, beyerdynamic, Sennheiser, Sony. You can find some decent stuff for around a centibuck. See if you can find anything that calls itself a reference headphone. Anything else is likely to be 'ear candy.'

My personal recommendation is out of your stated price range, but worth investigating. beyerdynamic DT 770 Pro. Sell for $200 most places, can be found for $150 if you look around. Incredibly flat, wide-range, comfortable reference phones with a huge dynamic range. I've had mine since the mid 1990s. I use them daily in my medical transcription work, then take them into the studio.

HTH,

R.

"My primary musical instrument is the personal computer."