Man, it's so weird seeing threads I posted in years ago being bumped up.
I currently have:
Beyerdynamic T5P V1 - My every-phone. Use them for portable use sometimes, as well as games, movies, music, etc. They generally get the most head time.
Sony MDR-CD900ST - My previous main headphone. Haven't seen much use lately because the T5Ps do almost everything better. I pop them on every once in a while, though.
Beyerdynamic DT770 Pro 80 - These are if I want to take really nice sound on the go, but don't want to risk breaking/having my T5Ps stolen. Also scratch my bass-head itch.
AKG M220 - They currently get the most head time because they're new. I think when the newness wears off they might be my portable 'phone for when I don't need isolation.
AKG K612 Pro - My extended listening headphone, and headphone I use for online games. I hate not being able to hear myself when doing voice chat, so the open feature is kind of a must for online use.
Koss Pro DJ100 - Old beater portable headphone. Pads are deteriorating, and they currently don't get a lot of use since they don't isolate well, but when I had fewer headphones they were what I reached for for portable use.
Sony ZX700 - Or rather, the one with the mic. Can't remember the exact model number of that. This is my main portable headphone, though. Isolation is exceptional, as is comfort, so it's good for that. Build quality is also nice.
Koss KSC-75 - They see no use anymore. I just pop them on from time to time so see if they sound as good as I remember. They do.
I'd sorta like to start thinning the herd, but I can't bring myself to part with the CD900STs again.