The senn momentums arent that great especially for the price, i would go for the HE 400, keep in mind that the e17 propably wont be powerful enough to give the headphones enough juice to keep volume levels as high as you might like.
Purchased Feb 2012, still in immaculate condition, has about 10 hours usage.
Comes with box and accessories.
I think these have 2 years warranty directly from v-moda.
Can ship internationally at cost, paypal add 3%.
i got a a900x recently, and you can definately hear it changing over time , the more you listen to it the better it gets. At the 10 hour mark i suddenly thought wow, where did this bass come from.
I look foreward to the 100 hour...