I would like to get familiar with VMware vSphere Hypervisor at home
and would like to know the cheapest recommended
system that one can put together to achieve this?
Maximum Amount of virtual machines I intend to run: 4 in all - (CentOS 5.5; Ubuntu; Windows 7)
Amount of physical Nics: Two
So please give me in your solution: The type of IC; memory; hard drive space; mother-board; graphics card, etc.
 If I wanted to upgrade to VMware vSphere
later (in order to get support etc.) with the above system, would this be possible? Note, if you don't know this answer, don't worry.