the bundled one is crap compared to HPM-70.
HPM-70 w/o bill is bout 300~ 400 bucks, but watch out..there are lots of fake one out in market.
just listen to it before buying and u can find the odd one outt..and do get the original out of the odds
or the same is bout 950 with bill.
nyways u can also flash ur phone with W610's firmware and enjoy the gr8 quality of walkman.
at stock a K550i + bundled earphones is pathetic. no beats and no treble..but got lots of mids.