ESXi and Hyper-V Server are quite similar. Both can't be managed from the host. ESXi requires vSphere and Hyper V needs Hyper-V Manager.
I wanted to try the VM's on Hyper-V Server 2012 because I didn't want the VM's tied to any one version of Windows Server, but it's proving to be challenging (for me, at least).
They're not tied to Windows Server. You are free to move them to other installation of Hyper-V. Do you have any server licenses currently? e.g. Server 2008R2?
If you're considering MultiPoint, I would get the full Server 2012 Standard instead since you get two instances. Then you can also use the full Server 2012 as the host. Have a Server 2012 VM acting as a terminal server. You also get your test Server 2012 VM. Then you can add the remainder of your virtual machines.
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