New iPhone 5, no computer

I just got my iPhone 5 and currently have a 4. I know I can backup through the cloud but that means I would lose all my non-photo stream pics and ringtones I made, is there anything else I would lose?

I have no computer until the new iMac is released, should I just wait or can I then transfer stuff from my old iPhone to my computer after?

Anyone have any ideas or suggestions on what I could/should do?