I have a question and a comment.
Question: What is this slide show you say the website has to have?
Comment: Why use word press it is a BLOG software not a CMS Software?
Personally I use Concrete 5 on many web sites, it is a CMS Software
Wordpress is also a fairly capable CMS in its own right, having moved on from its blogging roots.
I think the reason people lean to Wordpress (vice other content management platforms) is the relative simplicty for "less technical people" and, because it is a popular system, there is a broad base of support, plugins, mods, etc available for it. You can, and I have, setup a pretty decent squadron website in an afternoon if you have a good template or theme to start with. It is also easy to train people how to use, and if Lt Smeckler, the guy who originally setup the website, dies or quits CAP, as long as you have the passwords you've got a fair-to-middling chance of continuing to keep it up.
I've done Drupal, Typo3 & Concrete-based sites. The spin up time is considerably longer if you're not already an expert in that system (longer even than Wordpress would be from 'zero knowledge'), finding someone else who might have some knowledge of how to manage and maintain one of those is a little harder, and customizing (or finding someone to customize for) is more difficult.
Sometimes, we need the 95% solution deployed widely vs the 100% solution in a small number of installations.