Are there any global key combinations suitable or specifically reserved on OS X for user assignment?

I have found that Cmd+Control+A-Z are usually available for your custom global shortcuts.

A notable exception is Cmd+Control+F, which makes apps full-screen.

I too would like to be able to access a complete list, however, which is how I arrived to this page.

Here are Apple's official OS X Human Interface Guidelines for Keyboard Shortcuts.

The document appears to be a current, authoritative, and complete guide to assigning keyboard shortcuts. It covers both the conceptual basis for using particular modifier keys, as well as the nitty-gritty of exactly which keys and which combinations are reserved system-wide, or likely to be reserved in the future.

Here's second Apple page showing a complete summary of existing keyboard shortcuts.