What's your "data center complexity factor"?

After speaking with IT users, analysts and vendors, I've tried to draw-up a "map" of some of the most common data center management tools directly related to operations, and how they layer across typical infrastructures. So far, I see about 13 tools in use. (I'm not counting higher-level administrative tools e.g. compliance mgmt, accounting, problem management etc. - but watch this space for a future Blog)

I'm curious to see (a) if I have it right, and (b) how does *your* infrastructure management 'stack' up? Can you do better than 13? Worse?