What trade is your husband in? where possible it is better to try and secure a permant residency visa,this carries less ties and more freedom when in oz,you also qualify for lots fo things you wouldnt on a 457,medicare,centrelink,schools etc.To get one you have relavant experience and qualifications of skills on the demand list.I would recommend you have a look at the goverment website or the dept of immigration(
Department of Immigration and Citizenship ) this should help you a bit,migration agents such as Go Matilda,Visa Bureau etc can also help ,most offer an initial consultation
Cal x