If you use the Customization Specification, when the VM is deployed, the sysprep and subsequent reboot will be handled automatically. I can't think of a reason not to just go ahead and let it sysprep, to ensure uniqueness of things like WSUS id (if using WSUS), resetting event logs, resetting the Install Date in Windows,and other machine-specific cleanup. Using the customization spec you can also specify the Guest IP/DNS settings directly from the deploy from template wizard. Easy peasy.
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