The business visa route is to have money to start a business in Aust. If what you mean is buying at house in Sydney to get a PR, it does not work that way. The business route is where you are required to maintain a specific $$ turnover for your aussie business. There are a number of business visa and you need to see which one you qualify for. For instance:
http://www.immi.gov.au/Visas/Pages/890.aspx
http://www.immi.gov.au/Visas/Pages/188.aspx

There are a few more business visas you can look at at the immigration site.

Good luck!

All applicants are required to do chest Xray. If your wife is preg, you will have to inform your case officer to hold the application until after she has given birth.