Fostex T50RP Mk3 w/ Brainwavz Hybrid Pads (current go-to) - The funnest neutral-sounding headphone I've ever tried.
Fischer-Audio FA-003 (broken headband, retired for now) - my favorite headphone I've owned so far in terms of sound quality
Grado SR125 - great with acoustic tracks and vocals, mediocre with everything else, virtually indestructible cable
JVC HA-S500 all-round good portable headphones, fun bassy sound but slightly uncomfortable for long hearing sessions
AKG K450 - muddy-sounding portable headphones with excellent features and portability. Flimsy construction.
KZ ZST (current go to) - W-shaped frequency response and very forward and fun sounding little IEM. It can be a bit fatiguing after long sessions but they always liven me up with their bright forward sound.
Senfer UE - it's hard to characterize an earphone where nothing really stands out but at the same time, there aren't really any negative things I can point to in the Senfer UE. They are balanced sounding, have good clarity, slightly warmer than the KZ ATE but separation and soundstage is a bit worse. With that said though, I find myself picking these up very often
Tennmak Pro - somewhat dark sounding but very comfortable, light and well built. I had a small accident with mine and am trying to get a part to repair it but these are one of my favorite IEM.
KZ ZS3 - balanced, warm, V-shaped and comfortable - easiest earphone recommendation I can make to someone who doesn't know what they want
KZ ED9 - bass canons. Similar sound signature to the ZS3, but more potent bass, and better soundstage and separation
KZ ATE - great presence, decent soundstage with good separation of instruments and clarity. The casing rubs against inner ear which can be uncomfortable if you adjust them often, but other than that they can be worn for long periods of time without sounding fatiguing or becoming uncomfortable.
KZ ATR - very similar to the ZS3 but with the same shell as the ATE which make them a bit less comfortable to use for long sessions. A good bargain though as they often can be found around $5 or under on gearbest.com
Sennheiser CX200 (broken, will try to repair) - what I usually pick up when I want to listen to music walking around the house
Apple Earbuds - what I pick up when I can't find anything else
Brainwavz BLU-100 (current go-to) - Slightly colder sounding than the SBH80 but very clear sounding and appreciable. Slightly less than ideal for working out due to their subpar bass but very comfortable to wear (specially with the included Comply tips) and exercise with. They also come with great packaging and accessories.
KZ HDSE - haven't had a significant listen to these yet but first impression was good.
Sony SBH80 (broken, waiting for warranty) - my favorite to use on-the go, for workouts and motorcycle riding
Plantronics Backbeat Go 2 - very artificial sounding and cold. The only head-fi earphone recommendation that disappointed me until this day
Headphone Amp Inventory:
Audio-GD NFB 12
Smartphone: Xiaomi MI5 (very good value phone IMO)
Olympus OM-D E-M5 - a very nice small mirrorless cameras with very few flaws to point towards