You'd probably want something that ranges from a balanced signature to a deeper, v-shaped one. Balanced has a slight v-shape to it. Essentially, it has more prominent lows and highs (bass and treble) with the midrange dropping anywhere from slightly (or even unnoticeable) to a bit. Please note that your personal sound preferences will also play a huge roll in how you like a pair of headphones. If you have a sound preference, please do let us know ;)
Most IEMs do not need an external amp to work well, although some do improve with them, so you don't have to worry about that. Here are a few suggestions:
- Phonak PFE1xx** - adjustable sound, neutral or balanced. You can also get a bassier sound with the green filters (sold separately).
- V-Moda Vibrato* - balanced sound. Has some weight to the zinc housings, secure fit if worn over the ear with deep insertion. If you insert them properly, they should stay relatively secure when wearing them down as well.
- ThinkSound TS02** - v-shaped sound. Good comfort and overall value.
- ThinkSound MS01 - balanced sound (slightly bassy). Good comfort and overall value
- Brainwavz M3 - warmer sound. Good comfort overall, great value for the money.
- NuForce NE700** - Warm, bassy sound. Good comfort and value.
If you are looking for a different type of sound (not balanced or v-shaped), please do let us know. I've compiled a small list above. If you want to know more about any of the above models, don't hesitate to ask. Do keep researching though. Also, I'm not sure what you are using to run the headphones. The double star (**) means there are mic'd (with remote) and un-mic'd (audio only) models available, the single star (*) means there is only a mic'd (with remote) model available, and no star means it only comes with an audio only cable.