head-fi.org/forums
i wouldnt recommend asking mac users for headphone advice, as most are clueless when it comes to this.
again, this isn't to bash...but after seeing many threads with people recommending bose headphones and the beats by monster (dr. dre), skullcandys, i am sadly lead to believe this.
the shure e2c's are treble oriented phones, and seems like that is the sound signature you prefer. Based on that, i'd really recommend giving the etymotic er6i's a go.
I personally have the klipsch image x5's and love them. ultracomfortable and balanced sound.
I completely agree with Gothamm and Schneiderman on this not being the best place for IEM advice. head-fi.org is a much better spot. I had a pair of Shure E3c's which I loved but recently replaced due to a bad cable and Shure wanting $90.00 to repair it. I purchased a set of Sleek Audio SA-6's and think they are quite a bit better than the Shure's. I like the fact that they are modular so if your cable goes bad over time you can buy a new one for $25.00 I find that bad cables are the biggest problem with all IEM's. The Sleek's also have the ability to customize using bass and treble tuning ports. They are around $200.00 which is a good price. I purchased them from SoundEarphones.com.
James