Fostex T50RP Mk3 w/ Brainwavz Hybrid Pads (current go-to) - The funnest neutral-sounding headphone I've ever tried.
Koss KSC75 - A budget headphone that is fun, pleasant and comfortable to wear (less so to put on) that embarrasses the Grado I own and most of my other headphones
Fischer-Audio FA-003 (broken headband) - 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.
Vsonic GR07C (removable cable version) - the most accurate, well tuned and most resolving ear or headphone in my collection. It's hard to find something more accurate and resolving than the GR07C within the $100ish price bracket
Vsonic VSD3S - A warmer and slightly less resolving version of the GR07 that is enjoyable to listen to for long periods of time
Fiio F9 - V-shaped with a slight treble spike and slightly artificial-sounding highs but overall very comfortable, very durable and well built. An IEM I frequently pickup or carry around
Fiio F3 - warm, fun and pleasant. A better sounding version of something like the KZ ZS3 at a slightly higher cost.
VE Monk+ - earbuds that sound decent and cost less than McDonald's meal
VE Monk Lite - earbuds that sound slightly less decent than their Monk+ brethren but are more comfortable to wear due to their smaller shell
Ve Monk Lite (High Impedance Version) - a slightly more decent version of the Monk Lite that overall sounds smoother whose tuning seems slightly off.
KZ ZST - W-shaped frequency response and very forward and fun sounding little IEM. It can be a bit fatiguing to listen to after long sessions but I found that foam tips tone down their harshness. They make for a fun IEM to workout with. I currently use them connected to a bluetooth dongle
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
Apple Earbuds - one of the most underrated products Apple has ever made and the best earbud I've ever listened to. Yes, better than the Monks. Yes, better than those cheap Sennheiser earbuds.
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
Olympus OM-D E-M5 - a very nice small mirrorless cameras with very few flaws to point towards