I have a friend who travels a lot. She is looking for a pair of headphones to use on the plane to keep the noise out. She hates IEMs (what I would advise) so they're out. Please recommend a light, comfortable, sturdy headphone with decent sound quality and very good noise attenuation in an airplane enviroment. It will be used without an amp, more likely out of an ipod or similar player. Her budget is $300. Thanks in advance for your suggestions.