I am a newbie here also and been reading here a lot. From my experience even if you end up getting the T90s, don't think that then you won't have to look for another pair again. I said to myself that I have all I need and I am done buying headphones, 6 months ago when I had bought the...

Don't you think that a dt1880 would be too close to the t1 also? Without the choice of different impedances of course?