I had the same doubt. The only difference is that I already had 25Gb (about 3000 songs, btw, I wouldn't accept any song lower than 192 in bitrate, dunno about you ).
iPod 4G is very good and has great functionality (you gotta get used to it, first, anyway). The battery is still a weak point (only 10 hours of music), but it's the best choice if you have the cash for it.
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