Remove jailbreak without losing post jailbreak data

[Terminator45]

I jail broke my iPod 4g in early march, syncing my iPod just before I did it. Now I would like to "unjailbreak" my iPod. However, I've taken many photos since then which I must not lose, and also have recorded much inapp data. My question is, if I sync my iPod now, saving all my photos and app data, notes, etc. to iTunes, will I be able to keep my "clean" apps while removing Cydia and all it's counterparts? If so, how would I go about it? I would really not want to lose every scrap of data I've recorded since march. What I want to do this for is to sell this iPod and sync all my data to a new iPod...if I sync my iPod now, restore to factory settings, then sync my backup to a new iPod, will the new iPod be fouled up with jail broken data? Thank you in advance for your help!