(current collection in no particular order...) Sennheiser HD 545, Sennheiser HD 25SP, AKG K501, Etymotic ER4P, UE Super-Fi 5 Pro, V-Moda Vibe (puke), Phonak Audeo PFE 112
Headphone Amp Inventory:
Fiio E5, DIY WIP current doubled Cmoy in a wanna be mini^3 active ground setup, AMB Mini^3 kit, DIY Laff's Headbanger, the HP jack on my HK AVR 630 (hurray fake sounding Dolby Headphone processing!)
Home: Custom built PC on AMD platform, output from USB BantamDAC kit or spdif from X-Fi soundcard.
Portable: Sansa Fuze 8GB, iAudio U3 2GB
Other Audio Equipment:
Cmoy's modified Linkwitz passive crossfeed (original low-Z version), KRK Rokit 5, HK AVR 630 receiver, custom built 12" subs with 15" PR powered by Audiosource Amp3 and controlled by a Velodyne SMS-1 (EQ and crossover)