Can you post links (here or email me privately) to various CMS systems you are considering?
What's the time-frame for implementation? The requirements? A "feature/benefits" comparison is somewhat useful, but a specific point-by-point presentation of how a technology provides solutions to your (boss's) problems is a little stronger.
Remember, Nukes is v1.0, which means it doesn't currently have the number of modules available that some other solutions do. However, they are relatively easy to write / port and it's a pretty darn good framework to customize.