how do I easily migrate all my VMs (12) on my current ESXi 5.1 host to a new ESXi 5.1 host...?
[1] put the old host's hard drive in the new host and perform an upgrade from the ESXi 5.1 installation disc (both hosts' hard drives are identical)?
[2] put the old host's hard drive in the new host as a secondary drive, pop in the ESXi 5.1 installation disc to install ESXi 5.1 on the new host's hard drive, but migrate/import the VMs from the datastore on the secondary drive (old host's drive)?
[3] pop in the ESXi 5.1 installation disc to install ESXi 5.1 on the new host's hard drive. when complete, put the old host's hard drive in the new host as a secondary drive and copy/import the VMs from the datastore on the secondary drive (old host's drive) using VMware vSphere Client?
[4] install ESXi 5.1 on the new host, network it with the old host and use VMware vCenter Converter to import the VMs from the old host?