Hi,
what would be the sense of having vC Ops run in workstation?
Testing and learning.
You need a vCenter Server to monitor most resources, alternative would be standalone install if you want to monitor non vCenter related resources.
I have vCenter.
What you could however do is build a nested environment: Install one or two nested ESXi's install vCenter Server Appliance (or vCenter Server on Windows), then install vC Ops into that environment.
I already have a nested enviroment and previously had vcOPS in it.
Again big question for me stays what is the target you try to achieve?
I'm trying to aquire the necesary knowledge in order to edit the requirements of the OVF file, as I want to get familiar with that. In a second phase, I will try to use Hyperic and vcOPS connected (I'm familiar with vcOPS but not the Ent edition in a "mix" with Hyperic). This second step is something that I can do in my work office lab during the week. For my "laptop lab" and weekend I would prefer to explore a more "fun" option 
I was having doubts about starting this discussion in vcOPS community or the OVF community...it is actually a "OVF" question that happens to have something to do with a vcOPS ovf. I don't know if I can move the discussion to the other community, but I'll try.
Thanks anyway!
Regards,
elgreco81