FWIW, I owned the D7000s for a few weeks and didn't care for them. They are good solid headphones but just didn't have the sound I was looking for, especially in the midrange. I've owned the HF-1's in the past and, based on memory, preferred them to the D7000s. The HF-1's, and my regrettably sold vintage RS-1, led me down the Grado path to the GS1000s, PS1s, and now my HP2s.
I'd suggest ordering the HF-2. If you don't like it, which I doubt, you can always sell it here for a very minimal loss.
So, it's relieving to hear that the HF-1 has better midrange than the D7000. What I really like about the Denon is the texture and/or depth they bring to instruments though, neutral midrange non-withstanding and can you comment how does the HF-1 fare in this area?
And how does the HF-1 fare in the high region? Is it as harsh as the SR series? I can't live with that kind of screechy treble so it's a big no-no for me.