I have installed and tested loads more content management systems and finally settled on Drupal (I think?!) because of its large amount of support and documentation. I will be working on moving everything over during December and hopefully be done by January.
I have pushed back the dates for this yet again. (I know... bad me!) I have a good excuse this time though!
Went to a talk called 'Social Media Makeover' by Antonio Gould, a nice guy who seems to know a lot about the subject.