I don't own many. Gotten rid of some the last few years too.
Full-Sized:
1. JVC HA-RX700 - I use these mainly at home. The long wire and large size make them unweildingly clumsy for on-the-go. They have a nice laid back signature and are quite comfortable with minimal clamp.
2. Sony MDR-XB950AP/H - I plan on using these for trips and maybe some commuting. They have some nice bass (prefer analytical) but sound veiled and recessed compared to everything else I have. Very comfortable and soft earpads. Look nice with a brushed aluminum exterior. Bass seems to drop off nicely depending on the music you listen to. It was hard for me ranking this higher due to the veiled sound.
3. Monoprice 8323 - I still have the stock cables but just replaced the pads with the polyurethane ones. Much more comfortable and due to extensive OTG use mines has limited clamp. Still sounds odd to my ears. Feel like it needs more bass, a better soundstage, etc. Maybe others are right and these need new housings.
4. Coby CV-150? - I forgot the exact model for these. The cable broke halfway between the plug and the y-split. Dad helped me replace it with a jury rigged alternative. Thinking about tossing them. Okay sounding, uncomfortable vinyl pads, and next to no swivel on the cups. All of this plus my big ears make these the worst OTG phones.
Portable:
1. Photive PH-BT3 - My first pair of BT phones. Not bad. Fairly neutral, some bass (nothing exciting), lasts 12-14 hours on a full charge with max volume. Convienent without the hassle of wires.
2. Panasonic SHP-9500? - Don't recall the exact model off hand. It folds inward with a twist. Cups are small and they pinch my ears. Surprising good sounding (as joker already said in the shootout thread). Cable came out from the right ear. Reliefs are apparently useless. Tried supergluing back in. Gave them away to my mom. Cable came back out a few months later.
In-Ears:
1. Ultimate Ears Super.Fi 3 - My very first pair of IEMs. Awesome. Clear, analytical, made me happy for years. I eventually grew frustrated with the semi-memory wire. Tangled like crazy and the single flange tips no longer seal as well. Replacement double-flange tips weren't as thick and so I ended up back with the stock tips.
2. Soundmagic E10 - nice dynamics. I feel they are like a funner version of the UEs I have. Clear, decent bass, leans on the analytical side. Over great and comes with double-flange tips.
3. Meelectronics M9 - slightly veiled compared to e10s. Tips tend to bend in my ears. Way too flexible. After markets tips are just as bad (at least the ones I have).
4. Soundmagic PL-18 - pretty standard. Bass is a bit better then the E10s but lack some of the detail. Let brother borrow once and he lost them.
I want to get a nice pair of Senns in the future. Not sure which yet.