Concerning my comment above that even the Grado SR60 at $79 is more transparent than the HD 800 that drew several remarks (too many to quote here with my limited ability to use "multiple quote"
)
I feared perhaps I typed that without thinking, working from faulty memory, so this morning I went back and did my transparency comparison on the HD 800, powered by the HDVD 800, and the Grado SR60, powered by the Grado RA1 amp. Though I listened to several short pieces of various music, I concentrated on the first few seconds of "You're Going To Miss Me When I'm Gone," by Band of Heathens on their album
One Foot In The Ether and concentrating on the initial snare drum, bass drum, and guitar that starts the song
(This is the test I use for any of my transparency comparisons and is the most familiar).
I still think that the Grado is more transparent. Perhaps we are using that word differently. I ask which has the greater feeling of having a cloth in front of the speaker... that one is the less transparent. But high transparency can lead to sibilance (and does, for the Grado SR60), and the huge soundstage of the HD 800 can distract and wow you with overall quality if you are not focusing on transparency alone.
I will say that it is a small difference, and for the brief time I tried to be lazy and just run the Grados off the second output of the HDVD 800 for quick comparison, the difference was even less (if any), but when I put the Grado amp on the Grado headphones, there was a difference to me. I think the difference in amps arises from the relatively high (43 ohm) output impedance of the HDVD 800, perfect for the ~300 ohm HD 800 but too high for the 32 ohm Grados.
(By the way, I don't expect to convince anyone of anything except perhaps persuading them to listen to the two side by side, but I did need to check my own thoughts, since I was relying on memory when I said that. And I can't comment on the HF1 - don't have it and haven't heard it).