The Canon Pixma MP780 is a solid, midrange all-in-one that offers a smart feature set with full faxing, good paper handling, and low cost per page printing, though no networkability.
The Canon Pixma MX700 is a great choice for small offices with a wide variety of print tasks. This inkjet multifunction beats out the competition with a winning combination of features and performance.
The entry-level Canon Pixma MP160 is a decent all-in-one printer for the price, but don't be tempted by the entry-level machine: the Pixma MP180 costs a mere AU$20 more and provides the same print quality and a ton more features.
The HP OfficeJet 6310 offers lots of features to home users but falls short in the face of its competition. There are better all-in-ones for your home office.