Your advice please

Was planning on getting the Sennheiser HD 555 for my lapyop with a creative 2 zs sound card, but also saw the Sennheiser HD 595 for about 100 more. I maily will be using the headphones for movies and listening to MP3s. So i was wondering wat the differnece between the two are, because i cant tell, and if the mone is worth it? Thanks
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