audiotechnica ath-m50s studio headphones.
they work perfectly with an ipod classic. i could play all day all week long on a single charge despite being significantly more powerful and better than cheap headphones.
they also are likely the best sounding headphones under $250. the sennheisers are also nice however they are well known to have pretty weak bass while the m50s have quite a decent low end. (msrp is about $180 if i remember)
anyways just a thought for you to consider. its what i personally use on my own ipod. oh and if in the usa you can get them on ebay for $99