Can anyone recommend a robust CMS module?

Is it just me, or does OC simply suck at Content Management?

Honest question really. Information pages seems to be the only supported way out of the box, with no support for a page hierarchy, menu creation or menu management. This should be basic core functionality for a CMS.

Basically, I need my client to be able to add Content Pages to their OC site.
Pages should be capable of being added to more than just a single menu (without needing to edit templates).
They need the ability to add these pages to hierarchical navigation in the main menu and/or sidebars
e.g.
About Us (top level, appears in main menu)
- Testimonials
- Staff Profiles
- Staff Member 1
- Staff Member 2
- Staff Member n, etc
- Press & media
- Other page(s)

And, if my client decides to add a new menu later on (say Product Training, with multiple hierarchical sub-pages), that they can do that and add it to their main menu navigation WITHOUT requiring another module or having to modify template files.

Is this asking too much? I really hope not.

Can anyone recommend a robust CMS module for OpenCart? I'd rather not cobble together half a dozen modules to accomplish this if possible.

Thanks.