I got the Q701 right when I finished the other post. I didn't need to try them for very long, and my wife said they're both hideous, so I'll pick the one with the sound and comfort that I prefer: the HE-400.
I was surprised at how much volume I got out of the Q701 without an amp on my PC. But I did try them with the FiiO E10, and it was better. I liked the soundstage on the Q701 a lot, and if I were just a gamer, I actually might pick them over the Hifis. But generally I'm working on my PC, and I listen to music probably more than I can game, and I prefer how music sounds from the Hifi.
The other thing that made the decision easy, even though I didn't think would bug me, was the bumps on the bottom of the Q701 headband. Even if I liked the sound better overall, I probably would have sent the Q701 back and gone for the Annies or even the K702, because those bumps were really uncomfortable. I have a completely shaved head, so perhaps if I had some "extra hair padding", it would have been fine.
I was amazed at how much lighter the Q701 was over the HE400, but the HE400 is still by far more comfortable. So I'm keeping the HE400, thanks for all the advice everyone.
Good job, man. Now, granted, I totally disagree with you and this particularly biased thread with the HE-400, but who cares? You asked, you tried, and you came to your own conclusions. This whole community would be better off just going for it like you did because no forum is going to be able to answer all of your questions. It's all about the journey and the only god around here are your own ears.