Configurable products allows you to manage multiple options of a single product.
eWay is an Australian Gateway provider which offer a merchant hosted solution (i.e. you never leave your site). Payments are processed via a Server-to-Server connection (cURL).
With minimal interaction, you can run regular reports to find out which products need to be re-ordered ensuring you never run out of your most popular items.
Rate Matrix is a powerful shipping method that allows users to define shipping rates exactly how they need them.