to be honest and this is only my opinion, I would do something like Kendrick Coleman has done with his ESXI hosts (cheap and green) and then a NAS as an ISCSI target for VM's and perhaps two switches to seperate VM traffic from storage traffic
Then with the thousands left, treat yourself to a decent gaming pc?
That way you can usb boot the ESXI hosts and the storage in NAS based
food for though perhaps?
I have a single machine as a ESXI host and it runs all my labs without an issue, alternatively a single good spec machine and Vmware Workstation 8 would do for labs and you can run nested clusters of ESXI and/or Hyper-v