Yael, Have you seen this on the laura star website?
Laurastar DIRECT ONLY: Trade in offer -NOW ON-Trade in your old iron and receive a minimum $100 off the RRP of any NEW Laurastar iron. Promotion details- $100 for any common iron, $200 for any steam station and $300* for any Laurastar steam system. (one trade in per new iron, not to be used in conjunction with any other offer, ends March 28, 2009)
They have a list of their stockists and direct factory outlets in melbourne and sydney. Maybe going in to one of their stores,, they can show you the different features between the models.

Nic