Thanks for the reply.
I don't agree on the Joomla points. If you visit their forum you will see countless people asking how to include unique keywords for their category pages. There is no clean way of doing this. The best way is to use the plugin shsef404 and I don't think its great as you have to give up good page titles.
Joomla really is a nightmare when trying to create unique pages in terms of page titles / meta descriptions.
That has been my experience anyway and I spent a good few months on joomla.org talking with people on the SEO forum and there were a lot of other people having the same issues.