Simon look on ebay.
 
A couple of the guys have bought the 7" screen GPS units that come with a turn by turn street navigator for the city, but you can also run OziExplorer CE for your topo maps when in the bush etc. They look the ducks guts. I have a similar setup but it's only a 5" screen and a bit small.
 
Talk to Hiline ( Ray) at the gathering - these units are well in your budget range. There's plenty of digital topo and other maps for Ozi around in the group.
 
BTW hows the bumper I see it's gone from my driveway ? 

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