Specs for a dev ops sandbox server

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http://serverfault.com – The home build forums seem to be mostly about gaming, home theater, and home office topics, so trying here. Feel free to point me to a good alternative forum for this topic. I think many people here at least understand the requirements. I'd like to build my own home dev ops sandbox server or two. I want to run some or all of the following, to gain more experience in dev ops. kvm or other virtual machines maybe ganeti to manage the VMs small server stacks; apache web, app, HAproxy puppet nagios git/gitolite eventually maybe an LDAP server, mail server, etc. I'm envisioning a couple dozen (HowTos)