Windows Server 2012 Hyper-V License [duplicate]

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http://serverfault.com – I have a question about which license to purchase for a client setup that I am looking to implement. The scenario is that I want a Windows Server 2012 on bare metal running Hyper-V, a Windows Server 2011 as the first VM running on it, and then 4 virtual Windows 7 Professional VM's for the clients to connect to. So my question is, which version of Windows Server 2012 do I need for the Hyper-V setup (Standard Ed or Datacenter)? Thanks for any help! (HowTos)