Any examples of cloud ERP implementation cost/benefits analysis?

The business case for evaluating an on-premise vs. cloud ERP platform should take into account several factors:
(1) Acquisition costs - what are the costs associated with acquiring the hardware, software and services for each approach (obviously, acquisition costs will be higher for on-premise).
(2) Infrastructure costs - expenses associated with physical plant such as rent, utiliities, building security, building maintenance.
(3) Security controls - costs associated with implementing and managing security controls such as user access and permissions to physical systems. These costs are generally additive to building security (controlling access to the building vs. controlling access to the systems).
(4) Administration costs - costs associated with administering the solution - backups/restores, software updates, etc.
(5) Support costs - help desk, advanced trouble shooting
(6) Business Continuity costs - backup data center, data synchronization
(7) Integration costs - integrating ERP with operations systems (e.g. eCommerce, Inventory management, HR, etc.)
(8) Migration costs - if you're already on premise, what will it cost to move to the cloud and vice-verse.

If anyone is interested, I can put this in a spreadsheet on my blogsite and provide access to it.

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