Sennheiser HD 700 - I've had these for 6+ years, most of that time I've been running them through an Audioengine D1 DAC, amped via a Massdrop O2, plus some extensive EqualizerAPO DSP to flatten out their response. I consider these my 'reference' setup and am quite happy with them overall - current sources are generally music via Tidal at hifi or master quality.
Westone W40 IEMs - my travel headphones, used with some thick Comply foam tips and an Apple USB-C headphone adapter acting as the DAC. Rather warm, their response could be flatter, but they get the job done on long flights (isolation is quite good with deep Comply tips).
Sony MDR-80's - a blast from the past, these are mid-80's vintage on-ear headphones, sound surprisingly decent, and are also quite easy to drive. Despite their compact size, the cable is almost comically long (9-10ft). They also feel rather fragile, so they rarely (if ever) see any use outside of the house.
Google Pixel USB-C headset - meh, the built-in mic is appreciated and they are fine for phone calls, but if not for that mic, I probably would have given them away by now.