V6 is probably your best bet, no emphasized bass and flat midrange, with fairly forward highs. Usually highend headphones roll-off in the treble region by a good 10dB or so by 10-15kHz as our ears are more sensitive there, V6's frequency response measures flat all the way.
Shure SRH940 would be another option whit similar response and has better extension in the highs, the V6 starts rolling of after 10kHz but are very forward in the highs up to that point. AD700 would also be an option.
This is very wrong. You don't understand how to read these graphs. There is an "ideal curve" that represents neutral. You can think of it like a scale that's not zero'ed out. Those dips are not dips to the human ear, they are dips only relevant to the measurement technique.
Most high end headphones MOST CERTAINLY DO NOT roll off the treble. This is the problem with objective data, if it's read incorrectly, it can lead to less understanding which isn't the goal. Hopefully.