"Robert Morein" wrote in message
news
Are there any headphones that do a better job rejecting ambient
noise, yet are compatible with the limited power output of typical
portable audio devices?

Sure, IEMs.

However Bob, you strike me as being way too hysterical to be able to cope
with them. If you want to give the concept a spin, try some Koss "The Plug",
about $20 at Circuit City.