Anyone know what stores in the U.S. have the X2 on display? I know not every store carries the same display headphones, but maybe you had luck in a Best Buy, a Microcenter, a TigerDirect, etc...? Where have you personally tried the X2s in person at a store in the U.S.?
Also, the thing about carcinogens is legitimate--in certain circumstances. I don't believe that this is one of them. I have done some research on this before when purchasing some studio monitors. Its a chemical used in 53% of plastics, called DEHP. The reason it is used is because it is so cheap, economies of scale and all. There are studies that show working with the raw materials can be harmful, but the studies of it being harmful when airborn or via touch from daily products are inconclusive. 53% of all plastics have this harmful materials, so you aren't going to be able to avoid it just by buying a different set of cans. Honestly, I am not worried about it at all. The batteries and materials used in our cell phones are actually proven to be harmful, and I'm not about to give up my cellphone anytime soon.