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Generally the host server (the server you are talking about acting as a domain controller and supporting virtual machines [VMs]) should not be acting as a domain controller. From a purest perspective the host server for the VMs should be just that: a host for VMs. And since you are using Windows 2008 there is a much better way to ensure all the VMs get the best performance.
Instead of making the host a DC, you should probably look at using a server core installation and installing the HyperV option on this base install. This will provide the lowest possible resource utilization on the host and give the VMs the best chance to perform optimally.
Of course the drawback of using server core would be that you need an addition physical 2008 server to manage it, or you have to be proficient at WMI. If you don't want to go to server core and this is going to be your only physical server I would do a full/regular install of Windows, leave it in a workgroup, and run my domain members as VMs. It is a bit of a hassle managing a stand alone server, but if you made it a domain member and your only domain controllers were VMs you could have some issues upon reboots when none of the DCs are started when you reboot the host.
Long and short, your VM hosts should not be domain controllers when you can help it.
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