I would say to go with the Asus Zonar, they are some of the highest rated soundcards out the also the HT Omega's but the can get quite pricey, but its worth checking out their lower models.
Creative over the last few years has really taken a big dump on their customers with shoddy drivers, support, and over priced cards.
Asus Xonar - http://www.newegg.com/Product/Productcompare.aspx?Submit=ENE&N=40000057&IsNodeId=1&Description=asus%20xonar&bop=And&CompareItemList=57|29-132-017
HT Omega - http://www.newegg.com/Product/Product.aspx?Item=N82E16829271001&cm_re=ht_omega-_-29-271-001-_-Product
I know your in AU, but I am just using the Newegg.com website to give you a reference of the different models. IMHO thier is really no need to spend more than ~$80-$100 AUD on a soundcard unless your planning on doing some high end audio work on your PC.