Wordpress makes it really easy to set up a site full of static pages with a blog / news page as one section. Given an existing site which is just a collection of static pages I'd look at transferring the content into WP for a nice tightly-integrated minimal CMS where trusted users can be given the rights to edit pages as well as blog posts.
And provided your graphical menu is static then it's trivial to implement in a WP theme - it only gets tricky if you want it to follow a changeable page structure.
But obviously there are many other ways to achieve the same thing - it's down to personal choice and experience.
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