Thanks I did that and auditioned DT880 (2003). Well I did not like the sound signature though it is a very good headphone. It gives marvelous separation and soundstage. Very fast and low BASS. But the BASS lacks the oomph factor though I do not consider myself a bass-head. What I have heard from I think better choice for me, would be HD650. I do not have money to buy it this moment. As you said treble is not colored but more prominent. But it lacks something (may be punch) when it comes to modern genre such as pop, rap or hip hop ,which I listen a lot apart from acoustic music. It less forgiving for KP3 and poor recordings as it is very accurate.
I come from a pair of HD497 and I think I will go for HD580 as my first HI-FI can. Is there a place where I can buy a pair of HD600 grilles?