What is the best easiest to alter CMS?

I've also been hunting for a satisfactory CMS, with similar requirements. In my case, I care less about the ability to create modules (or having a pile of add-ons, particularly since there are often far better stand-alone options for the generic forum/gallery/etc plug ins), and more about the ability to create a site structure the way I want and the ability to define an arbitrary set of datatypes based on the particular page template.

That is, most CMS systems seem geared toward blog/news sites, while I want something that'll better handle a content-oriented site--organized sub-categories, each with a number of pages containing an organized data structure.

One I recently ran into is eZ Publish:

http://ez.no/ez_publish/cms

The admin interface and template editing aren't the friendliest I've seen, but it has a huge amount of flexibility in the data templates, and it's a lot easier to use than CMS systems with similar features I've tried. There's a commerical version, but also a GPL one.

Anybody tried this one?