Ether C, LFF Enigma, Alpha Prime, ZMF Omni Walnut, Fidelio X2 Balanced, NuForce MFB-200 Balanced (in order of sound quality)
Owned at one point or another Senn's 580, 600, 650, Grado's SR325 and RS1e, Beyer's DT990, TH-X00 and AKG K7XX - didn't keep any of them but I keep the above, and that's that. I'd still have my Alpha Dogs if it wasn't for the Omnis; the Dogs are great and deserve a place in the top list.
Headphone Amp Inventory:
Gustard H20, Yulong A28 (with SIL's 994enh opamps and Sparko's regs), CEntrance HiFi-M8, Musical Fidelity V90-BHA, Yulong D200, and finally, a couple of NuForce HA-200 amps in a mono-block stack with Dexa special edition opamps - this mono-block is something very, very special, no amplifier under $2K can stand up to it
Matrix X-Sabre, Yulong D200, Onkyo DX-1A
Audioquest Columbia DBS 72v, all others I made myself exclusively with Neothech's UPOCC cables and wires, ICs, USBs, adapters, headphones, IEMs, power, all.