Chris J
Headphoneus Supremus
I concur that the SRS-2170 > HD650 for sound quality. There's not really a comparison there.
The comfort on the SR-207 is just okay for me too. It's fine on my head, but once the pads get warm, they can get a bit moist.
I'm not a big fan of the feeling of the Senn HD650 on my head, I tried a pair once and had to take them off after 3 minutes.
To me, they had a vice like grip.
The Stax may not be as comfortable as Beyer DT880, but wearing them doesn't bother me.