Option 1

Continue running MacOS 10.8 (basically "as is", but with a few PhysIT modifications) until the computer has a problem not readily resolved without a clean install.
When asked to provide deeper support, PhysIT will need to create a clean install. (This will require Lou to reinstall his unique applications, including any research-specific applications. And for Lou to re-configure any unique settings in the OS and any of the applications.)
Primary support, including: Initial image and configuration, troubleshooting, upgrading software, and reimaging if broken. Use EZ-Backup, and assist with restores.
Responsible for following IT policies in configuration.
PhysIT adds computer into Physics inventory DB.
On Lou's request, we can recommend replacement hardware and procure hardware.

Lou has Admin access to make changes directly, and is responsible for changes made.
If PhysIT reimages the computer (with Lou's approval), Lou will need to re-do any changes he made with his Admin account, if they are still necessary.
If PhysIT reimages the computer (with Lou's approval), Lou will need to reinstall his unique applications and make any unique configuration changes he needs to the OS or to the base-line applications, if he deems them still necessary.
Responsible for following IT policies in its use.
Lou funds EZ-Backup costs.

Physics Admin
PhysIT registers devices

Q: Any improvements desired?
Lou funds repairs and replacements.
Lou funds network access.

Option 2

On Lou's request, we can initially set up OS and default applications, as PhysIT's schedule permits.
On Lou's request, we can recommend replacement hardware, procure hardware, as PhysIT's schedule permits.
PhysIT adds computer into Physics inventory DB.

Primary support, including: Initial image and configuration, troubleshooting, upgrading software, and restoration. Perform backups and restores. Responsible for following IT policies in configuration and use.

AccessNet
Annual registration by Lou

Q: Any improvements desired?
Lou funds repairs and replacements.
Lou funds network access.

Any networked printer?

Primary support, including: Troubleshooting, configuring and upgrading related software (if available). Responsible for following IT policies in configuration and use.
PhysIT adds computer into Physics inventory DB.

Physics Admin
PhysIT registers devices

Lou funds consumables, repairs, and replacements.
Lou funds network access.