Which of these would be considered closest to the TWFK IEM's of flagships? I have the HE-400 currently and I love the detail and transient response, but the sound signature isn't quite neutral. Would I be looking for something like a HE-6 eventually? I've read the list, just looking for some thoughts. I love the Rockit R-50's neutral signature. I previously owned the HD-600 but it wasn't as strong on it's speed and technicality.
I have to say the HD800. That was my line of thinking when I bought mine. It's fast, probably a little too bright, extremely comfortable and extremely detailed/revealing. I always pair my B2 with a Digizoid Zo (match made in heaven, Zo tones down the brightness quite nicely), I haven't QUITE found the magic with the HD800 yet, but every so often it's as I imagined it with various tubes and with some light EQing in the higher frequencies. Calling it a full size TWFK is not too farfetched.
It's a diva of a headphone. :(