[mslev]

Shure SE215s. Not all that expensive, but for the price they're an amazing IEM. You can also get a cable that has a mic/remote in it.

[Tarq0n]

Those are regular IEMs. By custom parent comment means ones with a casing made specifically to fit inside your ear. Random example: http://vaiopocket.up.seesaa.net/image/sleek5.jpg, these can cost 3-4x more than a regular pair.