Website update required - away from Dot Net Nuke to better format - PHP perhaps?

The website of our PR company was written in Dot Net Nuke and we would like to change this - primarily so that we can manage it ourselves.
We also want to incorporate a blog - not the grim little content management system we currently have - possibly using Wordpress.
The new site will incorporate all our social media (LinkedIn, Twitter and Facebook) and some of the text will change.
We also want to lose the flash and replace it with ??? In other words we want some movement - but for it to be available across multiple-platforms.
The site will also need to be visible on smartphones and tablets.
Please don't suggest the site be entirely written in Wordpress - which I don't believe will work for our specific business.
In brief, we need a clever, artistic and patient UK-based person to help change our presentation - but not our ethos.