earphones

So running 4-5 times a week, generally early in the morning, before it gets too hot and humid. Having music is a big help, actually. Especially the kickin' tracks assembled by DJ Dasterdly Daboo.
Problem is listening device.
The Bose headphones sound great and are really comfortable, but they are too big and cumbersome for running.
My Shure sound-isolating earphones are TOO good: they block ALL ambient sound so I can't hear traffic around me; sketchy dangerous.
The Bang & Olufson A8 earphones look cool and sound great, but don't fit my ears very well -- the clamp doesn't hold onto my ear when I run, and the earpiece itself is too big to wedge comfortably into my ear and keep it there.

So I need suggestions for decent, small, comfortable earphones to wear whilst running, that do NOT block out all ambient noise. Don't care about dynamic range; I am listening to ripped MP3 and AAC4 tracks whilst running and paying attention to ambient traffic noise, so I don't care about sound quality as much as comfort whilst running.
Suggestions?