Have you got much music on there? The way I do it now is I've joined Google music, put it all up there, and get an app gMusic or like for iOS and just stream music. I'm in UK though in a unlimited data plan, not sure what you are, but it streams and world fine.
I'm looking to get an iPhone 5 over the w/end, and I'm debating wether to go for the 16Gb or 32Gb...theres £70 difference...