Recomendation for best earphone out there?

Quick question....I am a die-hard rock music lover. Recently I have moved to a big ipod (Clic) from Nano( 2nd generation) and I am not quite satisfy with the earphone that Apple gave me along with it. Well to be honest the sound is acceptable but I cannot enjoy music without turning on the max or 75% of volume. To stop people staring at me in the subway or library, I would like to hear from you. What brand or model of earphone has a complete NO SOUND leakage. I just want to pump up the volume and stop disturbing my surrondings. I thank you in advance and hope to get some recomendations. Price should not be a problem unless the earphone is MADE BY NASA......