Does anyone have any recommendations about good enough in-ear headphones
for a portable MP3 player (no extra amplifier) for use when travelling?
Specific models or general advice about what to look out for and what
to avoid?

Like 'speakers I guess only my ears will provide the right answer
(including issues of comfort as well as sound) but it seems to be more
of a challenge to get a listen.

Also there used to be few models when I last looked but nowadays there
are just so many, so I am looking for some way to whittle down the list
of candidates. Is Etymotic (ER4P for example) still a quality place
to start?

Primarily classical material. Budget not a big issue as long as the
kit is in some way "worth it" (I do object to unnecessary extravagance).

--
John Phillips