Headphones - Senn HD 800 or Grado RS1i.......

I agree regarding the T1s. I went to 32 Ohm Audio in Portland and listened to all the flagship models from Sennheiser (800s sounded to forward/bright/analytical); Grados (hard to ignore but too much going on with the sound/imaging), Denons (great bass), etc. The ones that were most musical to my ears, with speed and fluidity, were the Beyer T1s. Matching Beyerdynamic A1 headphone amp pairs nicely too.

Same here, had Sennheiser 800 which sound more impressive at first listen than Beyerdynamic T1, but ultimately I didn't find them musical enough and now I'm quite pleased with T1. Can't wait to get the cord upgraded :-)

I'd like to also mention that even though I seemed to like what Grado PS1000 had to offer, the fact that I do a lot of listening while laying down on my bed didn't help, because these otherwise very good headphones, will NOT stay on your head the way they should and they will fall. Nobody mentioned this fact anywhere and in case I'm not the only one listening to cans while being in a horizontal position, I just wanted to be the potential buyers aware of this fact.

The T1's and the HD800's both have aspects i love.

T1's = Bass impact
HD800's = Soundstage

Anybody listened to the Beyerdynamic T1 with Naim Headline?