I got a one gigabyte memory stick with mine. It's more than enough for all of my music and game saves. I'll probably put some videos on it, but I'll need to download the media manager to convert the files first.
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Unban RadioactiveMan!
DaKilla: "We don't have the manpower to censor everyone's opinions."
4gig hard drive that also has a longer lasting battery and comes with media conversion software. It's a little pricey but if you bought 4gig worth of memory, another battery and the media manager it would be a lot more then that.