I'm going today to get a Nexus. I need to know if i need to unroot my OG so they can transfer numbers or does it matter?
Shouldn't matter, as long as your Contacts are sync'd with your Gmail you shouldn't need to worry. You don't need them to transfer numbers in store. lol
Also you can goto Contacts > Settings > Backup and it'll save them to your SD card, which you can restore on your new phone.