When converting to AAC?

I just got my iPod Nano and I have about 1700 mp3's now I'd like to convert them a little at a time to AAC because converting them all at once will take all day. But when I convert say 100 and then try again if I already converted a song it doesn't skip it it will RE-convert it using up valuable time. Any ideas how to tell iTunes to skip tunes already converted? Or do I have to keep track of each and every song?

AAC is usually better quality than MP3 at the same bit rate.
AAC 128 kbps is usually at least as good as 160 kbps MP3 but ~25% smaller file size.
When converting, you should always start with the highest quality possible. Since AAC and MP3 are both lossy, when converted to this format the first time, you lose quality. Convert them again and you lose more quality.
If you are going to use AAC, convert from the CD.
If they are already MP3 and you do not have the original, leave them as MP3 as you will simply reduce the quality.

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    john233694145 wrote:
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