For sheer effortlessness of music presentation, I would go for the 007. Whilst the HE-6 is wonderful, I suspect there would be fatigue factor if you use it for everyday listening. Don't get me wrong: I love the HE-6. I have 2 pairs. The second pair I picked up after hearing that it has been discontinued by Hifiman.
Headphone Reviews and Discussion - Head-Fi.org
Do you prefer the SQ of the 007Mk2 to the HE6?