Personally I'd go with vsphere and look at one of the Essentials bundles as that will give you cluster capability as well as central control from vCenter.
I don't have anything against Hyper-V as I've never actually used it, but my reservations and reasons for not doing so are two-fold: 1) Hardware compatibility - with vsphere you have a HCL and if it's on that, vmware will supply everything, you just download and insert the media when necessary. With Hyper-V the hardware may be supported but you may still have to go download drivers from Broadcom or whoever before you have a working Hyper-V server. 2) Support - with vsphere you can pay vmware for support, or you can use their forums for free. With Hyper-V unless you have some sort of enterprise agreement my understanding (and it is just an understanding, I could be dead wrong) is that you can't purchase support cheaply just on Hyper-V. ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to listmana...@lyris.sunbeltsoftware.com with the body: unsubscribe ntsysadmin