Sorry, I don't mean to pick on you, but I'm gonna have to side with jerg on this one; that description is definitely not what I would use to describe the HE-500 at all... In any case, I'm sure a thorough/detailed comparison of the T1 vs D7100 would've still been useful for the OP if he hadn't already made up his mind.
Now you see how stupid I sounded when I make a uninformed statement without experience? That's exactly why I avoided talking about HE-500 in the first place, because I know something like this would happen. I just said that description on purpose to prove my point.
To OP: The 7100 has more "detail" than the 600 for sure, but that may just be from the extra treble peak. The T1's details sound more natural and balanced to me. The 7100 is also more sibilant than the 600.
I still won't talk about HE-500 for obvious reasons, but one thing I know you'll have to sacrifice for sure if you go with them over the T1 or D7100 is comfort, due to the weight. T1 is the most comfortable headphone I've had to date. No head pain whatsoever after 4-5 hours straight.