I know it seems minor but like Ralph mentioned sites that have loads of spelling/grammatical errors reeks of incompetence. If you are not great at that stuff have someone proof read it as sites that don't bother with proper English skills make me question their ability in all other areas.
Also I know it has been mentioned already but aim to be the Aussie TF store with the BEST customer service rather than the cheapest prices. We are all used to paying (relatively) ridiculous prices for our "toys" so a few dollars here and there means nothing to a lot of us if the service is exceptional. Aim for exceptional, not just good.