I have a Musical Fidelity M1 HPA and a Feliks Audio Elise (tube). Maybe there will be yet another headphone amp next year.
I also have some Stax; Stax SR L700 and SR-007 Mk2 which I drive with a Mjolnir KGSSHV.
I've tried HD800, HD800s, HD700 and HD650. I didn't like any of them of different reasons.
I don't want analytical headphones as HD800 and HD800s. I rather sacrifice "the truth, the whole truth and nothing but the truth" for musicality.
I live in Sweden, so...;)