Whats your thoughts on Vmware server over esxi? Really do not want to have to budget for Virtualization if I do not have to. Thanks for any info.
Here is a comparison of VMware ESXi and Server notice that server doesn't cost money.
http://www.vmware.com/products/server/faqs.html
both are proprietary there are a lot of good FOSS alternatives such:
KVM (require a modern hardware) Xen (need a patched kernel: available in centos repos) OpenVZ (need a patched kernel: available in openvz repos, mainly for VPS but personalty i use it)
HTH