I have been happy with the Sennheiser MX270, which would fall at the low-end of your budget. They're comfortable and give a decent sound, but would not stay in place if you were being very active or working out. I have been using my set for about 2 years, usually while programming or traveling.
On a related note.... You should specify what you will be doing while wearing the earbuds, and if you require other features like external volume control, native interface to the iPod, etc.
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