Hmmm...I think Etymotic would be the best choice.
One of my friends says that the dynamic offerings of Etymotic sound very similar to the ER4, which I do believe looking at how their IEMs are reated with that 85% accuracy rating or what ever it is,
I've got the MH1c, and it's ok. Sounds boring, but so do the Etymotics in my ears. I might be coming out of a neutral loving stage, yet I keep looking for more neutral headphones :/
To be honest, look in the For Sale forums and look for a cheap pair of IEMs. They pop up once in a while which lets you get a more expensive IEM for a lot cheaper.
The people on this site are more than trustworthy, so you know they've taken care of their IEMs.