Brian,
You could try Microsoft Hyper-V Server 2012 R2. It's completely free and supports the following:

64 virtual processors per virtual machine 1 TB per virtual machine 64 TB per virtual hard disk 320 logical processors on the computer that runs Hyper-V 4 TB on the computer that runs Hyper-V 1024 virtual machines per host server
You can get more info at http://technet.microsoft.com/en-us/library/hh833682.aspx
And you can download it from http://www.microsoft.com/en-us/evalcenter/evaluate-hyper-v-server-2012-r2
Note: It does not include the full Windows GUI as such but you can manage it remotely via Server Manager.
Thanks
Tim

James,
We had originally decided that the vlab was to be a sandbox environment, the chance for users to build everything. The configuration was to begin with just the most basic idea of connectivity. This way people could build and try what they wanted to do.
We are talking about building up scenarios. This is on our list of to dos that continues to grow. *sigh -- we're trying*
The isolated server is set up at it's default install which means the firewall is on and may need to be reconfigured for basic connectivity. I normally disable it to prove that it is connected to the network, then go back and turn on the firewall and enable the connectivity through it I need.
Cordially,
Ronnie