Ever feel the temptation to run your iDevice straight into a set of 250-ohm Beyerdynamic or Sennheiser cans? You could, but the resulting sound would hardly rock you. Thankfully, NuForce's colorful Icon iDo is ready to assist in your iAudiophile needs for only $250. This headphone amp -- supporting sampling rates up to 48kHz, 24-bits of resolution and a 10-20kHz frequency -- cables into your iPod's 30-pin connector to bypass the digital audio converter and uses its own to