Pescolar,
An upgrade from the stock power cord to the PS Audio Xstream Power Punch C7 is worth the $50 investment. The result is better dynamic range, a punchier and better defined bass and lower noise floor. An even better power cord is the Furutech G-320Ag-18F8. A friend brought his over and let me audition it with my Playstation. It's even more refined than the PS Audio cord, but it's also more than double the price. Jeff Day of Six Moons gave it a Blue Moon Award.