A few questions on your requirements...
The site you mention also has a few other items. Not sure if you need them incorporated in to any quote as well.
1) It looks like they have a whole classified ads section. Do you need this? If so, how do you see this working (i.e. will members pay to post, or pay per post?)
2) The site also has advertisers. Do you need a module for that, or do you plan on just using google ad sense or something similar?
3) The site also has an image gallery. Do you need that functionality as well?
4) Looks like they also have PHPBB for forums. I'm guessing you'd want something similar.
5) The site has a few flash files, do you need those re-created / developed as well? (http://fishnet.com.au/default.aspx?id=231)?