That's big praise for the HE-6. While i haven't had first-hand experience to compare all of them at once, I'm not surprised with your findings as I have come to a very similar conclusion myself. That is why I fell in love with the T1 for so long, until I gave the HE-6 a second chance as I knew I never gave it the attention to detail it deserved. I too find it to be the least fatiguing amongst the flagships i have owned and it sounds great with all genres. I used to keep all my cans since they each offered something unique and sort of as a badge of pride lol. But now I am just really picky, if I'm not extremely pleased with one, or it gets little head time I don't keep it around anymore. The HE-6 is here to stay that's for sure, even over the HD-800 if it came down to just one headphone.
I may end up selling the rest of my gears to fund a better speaker amp for the HE-6, and perhaps a pair of loudspeakers too. The good thing about using a speaker amp to drive the HE-6 is that you don't need to purchase an extra headphone amp, and can use your speaker amp to drive speakers too. Fairly obvious, I know, but worth mentioning.
Edited by songmic - 10/29/13 at 8:55am