I have a guilty pleasure with Bose 'phones, but I'd rather not get the pulp beaten out of me, so I'll leave those alone - I think they only sound good to me because I'm nowhere near an audiophile. They aren't very neutral or balanced, but for some reason my ears like them. I've gotten them all used to try them out and refuse to pay their full price.
Enough about sub-par phones, though. Forgive my ears! They sound good to me and seemingly no one else!
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In the past few months I've acquired the Senn HD 238's. These are a great open headphone. They are pretty comfortable to me as well. They are very balanced and detailed for the price. They're going for roughly $75-85 used these days. I use these for listening before bed.
The highs are very crisp and clear without sounding too bright and the mids and bass are present but not overwhelming. One of my qualms with this phone is that it doesn't prefer higher volumes, which seems to go against what headroom has to say about it.
The treble starts getting harsh with a bit of crunch to it if too much volume is pumped into these. Not too disappointing, as I use them in a mostly-silent environment. Being an open phone, they have 0 isolation though, and I can hear my mini-fridge's low hum through these while listening to podcasts/talking or very soft music. Overall, they have some of the most detailed and balanced sound I've heard at this price.
Most Sony headphones/buds/canalphones I've tried in the $30-$100 price range have really disappointed me. They seem to have no preference for treble, and it always sounds either very harsh and distorted or non-present. I have the MDR-EX36V's and they are very disappointing other than isolation - I use them when I mow the yard. That's about it. I need to find a better canalphone for mowing. lol
Another pair I've had for awhile are the Senn HD 202's. They are a budget phone, but for the $20-25 price tag, they are nearly unbeatable in SQ for a closed phone, IMHO. The treble on these bothers me, as it is a bit grainy and loses some detail. Which is sad, as these are definitely a treble-biased phone. There is almost no bass to speak of. Mid/upper bass is present, but if you're looking for any kind of punch or richness, you won't find it here.