Sync without deleted from Touch (4th)

I rarely sync with iTunes but my current phone is almost up and I'm wanting an iPhone. What I'm simply trying to to is get my purchased music from my current iPod Touch into my iTunes so that if/when I get my iPhone I can have my music ready for it.



My issue is that when I sync it won't put my recent music (purchased on my iPod) into my iTunes. It just gives me the warning that my music will be deleted from my device. I just want my iPod and my iTunes to match, that's all. I want my newer music on my iPod to stay on my iPod but also into my iTunes. I have my iTunes set on manual sync, but I'm just not sure what to do. I've had this problem before but it was a long time ago and I don't remember the fix.



Also if I do end up getting an iPhone can i just re-download iTunes music that I've already purchased without charge onto the new device?



Thanks.

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