Been using Etymotic ER-6i for...at least 2-3 years. I've gotten really good life with them...which is good, because they were pretty spendy. I am kind of an audio snob, though...I use the Etymotics all the time, from listening on the iPod/phone to using them as in-ear monitors when I play bass gigs. Fit great under the helmet too.
The ER-6i is discontinued...current comparable model is HF5:
http://www.etymotic.com/ephp/hf5.html
^^^^^^^^^^^ agreed, when second best won't do =)