There is a local meet in Dallas on June 9th, and I won't be buying anything until June 14th. I will hopefully be able to go to it. Just finding out opinions beforehand. I don't know if they'll have any of these at the meet, though.
The lower mids are louder then on my 280s, but the upper mids aren't. I don't think I'll have any problems, though...
Even if I don't go to the meet, I can try out the HD 600s whenever I want. There's a place to try out sennheiser and grados headphones right down the road from my university.
Well I'll be there with my own HD600. You're welcome to use it!