Hi Tiberian,
Sweet little rig you got there!
I used to have a pair of Senn 580's and they were extremely comfortable, insanely effecient, and VERY enjoyable overall. Despite these strengths, I ditched them in favor of closed headphones. While I appreciated the full open back approach Senn used, they just didn't do rock, blues, jazz, or anything with a kick drum justice. I was constantly putting my hands over the screens. While others praise the design, it seemed (to me) to be their only fault. I'd really like to get another pair of Senns and try a pair of those cups, now!
For your 650's- did you go with the screened or standard version of the woody??
Worth the money? How did it change things?
Thanks!