The T1 is such an incredible all rounder, really recommendable to a music lover who enjoys a bit of everything. Today I had the opportunity to show my headphones for a couple of hours a good friend of mine I has not seen in person in years - he is normally a speakers guy. Safe to say he is now off to buy a T1 himself due to its all round capabilities.
I do a similar thing to you guys, I rotate through my headphones for the different sound signatures, but I do so every few days/for genres. I can get used to a new signature pretty quickly, say within a couple of hours despite using each for 4-8 hours in a day. I'm currently on a Dubsteb, DnB, Trance binge with the TH900
The W3000anv is on my short list to buy in a couple of months. Still interested in buying/trying the HD800, K812, LCDX, MS-Pro/PS500 and the Alpha Dog.