If you are considering a new website development and looking at open source platforms such as word press, drupal, and others... we think you really need to be taking a look at Joomla / WoocomCMS as it offers far great scalability and control
Wordpress is a great platform but in our mind has limitations. There are plenty of wordpress development companies in perth western Australia and some do a great job.
The problems with wordpress is not the developers, but more the limitations and available add-ons.
If you are serious about your business and want a website development that will grow with your business and get results by all means investigate wordpress, but also investigate what Woocom has to offer.
From Wikipedia - http://en.wikipedia.org/wiki/WordPress