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Battery operated devices usually deliver longer battery life with higher impedance headphones. Not always, but a majority of players will deliver longer battery life.
You have to balance raising the impedance (for better battery life) with getting too far from the ideal impedance for the player (which may introduce distortions).
Lets say that the stock headphones might be 8 ohms, going to 32 ohms will be about the furthest you should go, give or take 8 ohms. If the stock headphones are already 32 ohms, I do not know of any headphones which are > 32 ohms, so maybe plan on staying at 32 ohms.
I like my Koss UR-20s, good sound but they are classic cans, completely over the ear (circum-aural) - some folks think this style is too hot to wear. No volume controls. $30 at a Circuit City last summer. HTH.
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