Migrating 1Password to a new Machine
All your 1Password data is kept in this file:
/Users/your-user-id/Library/Keychains/1Password.keychain
When you move to a new machine, you simply need to copy that file to your new Mac.
If you end up having two computers, you can use .Mac to sync this keychain automatically between the machines, or you can manually copy the file between them (or setup an automatic script).