You can't go wrong with the X1 for $169.99. I'd be very happy with that purchase
The K7XX is going to sound extremely similar/identical to the K702 anniversary, which is mentioned and compared heavily to the X1 in this review.
The Q701 is a good upgrade from the AD700. Not really an upgrade in soundstage, but an upgrade in overall sound quality and signature for sure. I went from AD700 -> Q701 and I was very happy with the upgrade. I think it would be difficult to rank ALL headphones in order from worst to best soundstage, especially as I (and probably no one else) has heard all the headphones on the list. I think some kind of star rating for the soundstage would be more...
With all the K7XX action going on, does anyone want my custom AKG cable for $10 shipped?
It's long, and a bit stiff (no innuendos intended!) but it's really durable.
It's 16' long with Belden shielded 22 AWG twisted cable with extra tough sleeving and a TA3FX mini XLR and Neutrik stereo 1/4" connector with silver solder. Same as this one.
I heard they changed the velour material a little on the X2. Supposedly made it less itchy (not that I had any problem with the X1). You notice anything different with the velour? Ear cups seem about the same depth roominess inside?