Geez... too many to list right now! Favorite big cans are HD-590s. Favorite IEM's is harder: Ultimate Ear SuperFi 5 Pro's are nice for some things while my Etymotic ER-6's have better isolation. I don't usually wear either at the gym.
Headphone Amp Inventory:
Benchmark DAC1 Pre
Lots of things from low-fi to audiophile approved to high-end test equipment.
Audiophile, geek, engineer. More at: http://nwavguy.com