Agree with Mezmo re: Etymotics. I have a pair of the ER-4S and highly recommend them. They are not cheap. They look similar to an earplug and offer fidelity that is simply remarkable for its design. The other great benefit is that they also attenuate external noise such as jet engine or rail noise which allows one to relax and feel much perkier when he arrives at his destination.
Check 'em out. Might just be the ticket for your needs.
Check 'em out. Might just be the ticket for your needs.