Best Sennheiser Headphones for Wireless

i purchased this product due to my previous experience of owning sennheiser head phones.

sennheiser cx 400 in-ear headphone (black)

it`s my first time use a sennheiser earphone, i was shocked, i think i`ll never choose other brand earphones anymore.

straight plug - i would have preferred if sennheiser had provided an angle plug for the headphones (those where the wire comes out at a right angle from the plug).

for more sophisticated headphone like my etymo 3's or these sennheisers, they only sound good with apple's i tunes at 256 bits.

i have heard that there are many knock-off sennheisers out there, but it seems that most of the amazon sellers are pretty reliable.

for background my headphone collection collection consists of full size sennheiser hd-580's, the wireless sennheiser rs-120's, sennheiser cx-300's canals, and now the cx-500's

when i discovered they were counterfeit, i contacted sennheiser to find out if amazon.com was an authorized seller (i was sure amazon would only deal with legitimate products, but after getting