Just a suggestion, shouldn't the HE400i and HE560i supplant the older versions? If makes more sense to sell those versus trying to get the older versions, since the news ones sound better and are more comfy.
I find the Sennheiser HD600 to be the best headphones ever. Even over the high-end headphones I've tried. I am voting for HD650 however since it is the highest voted and for selfish reasons... so that I can have both the HD600 and HD650 :)
I agree. I liked the 600 over the 650. Got the Philips 9500 for $50 and they kick butt. I can't imagine how good the X2 are. Philips just needs to run some specials on their most expensive/best phones. The X2s for $175 and they are mine.
It's great to hear that you're also a fan of 600 and X2 over the 650. It would be wonderful for the either to drop here rather than the cyclical lowrange/midrange headphones (looking at you M50). They may be easier on the wallet, but they are placed comparatively low in the diminishing rate of return when we can enjoy the equilibrium of value for not too much extra.
Sonic Electronix has a deal on the hd650s, but you have to PM him through Head Fi which means it's too low to publish. I have done business with these folks before. No problems.