Thanks! Probably the HD800 is what you're looking for. Potentially the HD700 would be a good choice as well.
I just upgraded from the Q701 to the HE-400. I haven't heard the HE-500, but here are my basic impressions:
Bass -- So much better on the HE-400. It goes just as deep, if not deeper, hits much harder, and is faster. Even though it's faster, it's not necessarily "tighter," since the HE-400 has much more midbass.
Midrange -- More recessed compared to the Q701, but it has a fast, tactile edge that really sounds nice on distorted guiters and synths. More crunch.
Highs -- Maybe not as extended as the Q701. The HE-400 are less bright overall, but there is a peak in the treble that gives it some sparkle (or fatigue, depending on how much you like highs). I thought the highs on the Q701 were smoother, but also more emphasized.
Soundstage/ Imaging -- The HE-400 have a smaller soundstage, but not by a large amount. However, the imaging is significantly better and more precise. I found the Q701s emphasized width but could also sound too diffuse. The HE-400 are more focused and 3D. You are closer to the music and the center image is denser.
Detail -- A bit more detail through the HE-400. The Q701, with their brighter sound, can make small details louder and more obvious, but the HE-400 reveals more in the end. You have to listen more closely though.
Overall, the HE-400 have more of a "v-shaped" signature, with a focused and precise soundstage that's moderately smaller. The imaging is really much more defined. The HE-400 have a lot more midbass and a denser, thicker sound. Somewhat paradoxically, though, the HE-400 is also faster and more resolving. Sounds snap in and out of a nice, black background, and there is a tactile and precisely textured weight to the bass and midrange.
Hope that helps.
Thanks! I'm glad you like them!!
Just wanted to take a minute and say that the original post is still amazing and that I continually come back to it as a reference. I actually sort of wish there was another one of these for cans that didn't quite make the cut (or weren't flagships), but that's just being greedy.
Also, this was the tipping point that made me take a blind leap towards the LCD-3's, and I couldn't be happier with 'em.
Thanks for the great reviews!