Hmmm. I've had my T1s for a week or so...and then yesterday I bought the HD800 during the Amazon $889 deal (could not stop my finger from clicking the add to cart button).
I feel the same way about my T1. I simply can't imagine another headphone being as well balanced and musical as the Beyerdynamic. The Stax SR009 is the only other headphone I've heard that has wowed me more than the T1.
I'm guessing I'm going to send back those HD800s sooner or later. Any less bass than the T1s would be too little...any more and the perfect balance would be disrupted. For the past week I've been coming home after work to listen to music until I have to go to bed.
... I want the T1 >.>
I wonder if I even need to get the T90 q.q