I currently have an iPhone 3Gs. My iPhone 4S is coming in the mail. I plan on using my iPhone 3Gs as my iPod and my iPhone 4S as my phone. I have about 20-25GB of music and apps that I don't necessarily want on my new iPhone. Should I make two iTunes libraries and manage them separately (one for my "iPod aka iPhone 3Gs" and one for my new iPhone)? Or should I just sync stuff separately? Also, how would this affect iCloud? I'm really lost. Any help is appreciated.