Hi,
You might find that your choice of suburbs is dictated by the amount of money you want to spend and if you need to be near public transportation (train line, buses, etc).
Unfortunatley you're not likely to get the kind of info you're looking for on this website. There just aren't that many Canadians going to Oz and Brisbane specifically (using this website anyway!). I'm in Brisbane but on the south east side in the Bayside suburbs so I can't comment on the western suburbs. From what you said it'd probably be best to stick to the north west side of the city. There are lots of nice suburbs up there. Maybe up by The Gap.
I would suggest checking out the realestate website:
http://www.realestate.com.au
There are tabs at the top for buying or renting.
You can also use this map website to check the location of all the suburbs, it shows the train lines as well.
http://www.whereis.com.au
For more detailed information I'd try this site:
http://britishexpats.com/forum/forumdisplay.php?f=54
It's designed for people from the
UK because apparently they like to leave their home country in droves! But there are people from all over on there, and even a few Canadians. If you ask a question there you'll probably get lots of good advice.
Good luck,
Haley