I hate hate HATE that having an iPod means you MUST use iTunes. There's no technological reason for this, just a way for them to market to you. I don't know if the Zune requires windows media or some other proprietary program, but it'd be worth looking into.
Meanwhile, there are tons of other similar mp3/video/etc playing devices that don't require any special software AND have a replaceable battery. I'd suggest one of those, personally.
Sorry I didn't answer your question directly =T
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