While you appreciate quality sound, you won't go to audio-maniacal lengths to obtain it -- spending thousands on equipment, kidnapping the entire Boston Symphony Orchestra, etc. For professional fidelity at a reasonable price, get your hands on a pair of Shure SE110 earphones.
Started as a microphone manufacturer in 1925, Shure's projected the voices of everyone from Presidents like LBJ addressing issues of grave national importance, to talk show hosts like Jay Leno mocking the grave faults of presidents/grabby chimpanzees. The SE110s are their superbly-crafted entry-level earphones, equipped with a specially-designed balanced microspeaker that provides unparalleled clarity at both ends of the register -- optimizing both bass-driven hip-hop and the treble'd Melanesian chanting you fondly associate with those dug-out canoe trips with your missionary parents. Just as important is the 110's extraordinary Sound Isolating Design, with sleeves that'll block out 90% of all ambient noise while snugly fitting into your ear (unlike out-of-the-box earphones, which feel like jamming breath mints into your canals).
Of course, none of this matters if the connection between your cables and speakers is compromised, so the 110's thick layer of reinforcement'll save your Shures from prematurely wearing out -- unlike the kidnapped oboist who is right now trying to dig his way out of your cellar.