The Creative EP-630 might be a good option.
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Excellent sound quality (very tough to beat at this price point) with a pretty neutral frequency response. Good passive noise blocking - when used on an airplane, with no music playing, the engine noise is almost completely blocked out.
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For me, at least, quite comfortable when using for a couple of hours.
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Symmetrical.
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No volume control on cord.
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Cord is 4 feet long.
Lots of reviews around for you to check as well. While the list is $40 (above your budget), there are often deals on these that would bring it within your range.
