For housing costs check out:
http://www.realestate.com.au
There's are tabs at the top for renting and buying. It will give you a good idea of the costs.
For a map to get to know where all the suburbs are check out:
http://www.whereis.com.au
I can't comment about Perth, but we've been very happy with our move to Brisbane. We really like
Australia so yes, it's been a good move for us.
I suggest having a look around on this site for more info on perth:
http://britishexpats.com/forum/forumdisplay.php?f=54
If you use the search function you can find lots of info about Perth.
You could also try this one, I've never used it though because we don't live there.
http://www.pomsinperth.com/discussionboard/