I have E2c, E4, Etymotic, UE, and a couple of sealed can phones, and I would recommend the E2c for this particular application, unhesitatingly.
Good set of cans for a good price, very sturdy (more so than most similar designs,) and significantly less microphonic than the Etys recommended by an earlier poster (which I would never suggest for running/biking, btw.)
Good choice.
Check out the b-stock page at
www.headphone.com before you buy, though - they have a set of E4g on there for $160 right now...
.
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