I picked up a pair of E4c phones in Singapore at Sim Lim last week (not the best deal, but they're next to impossible to get in person here) and have been quite impressed. Used them on the SIN-CHC flight this past Friday and they were excellent.

Easy enough to get a seal once you get the knack for it, and helps me to have the cord over the top of my ear.

Bass is quite clean - not terribly boomy (depends on the source, of course), but very distinct. Mids and highs are perfect, in my opinion.

I use with my N710 minidisc, so the sound output is excellent. Wife wanted to try them with her Ipod Mini. "Ah, no, dear. Just keep using your Apple buds..."