I have tried many GPS units and to be honest, they are all much the same. In my opinion, the thing that matters the most is how big the display is. Get the biggest display you can afford.
In the end, I went for a Panasonic Toughbook PC with built-in GPS pod and 10" screen. I know not everybody can afford this, but screen size matters.
It isn't going to matter if it is accurate to 3 metres or 7 metres, you'll know where you are when you get that close.
Both Garmin and Magellan make good units with good software available to help manipulate waypoints, routes etc.
Alternatively match your new GPS with OziExplorer software, an excellent product. OziExplorer lets you use a wide variety of commercially available maps, such as the Natmap raster maps or the Hema Great Desert Track maps to plot cousrses, routes, waypoints etc. If you hav e a laptop you can plug almost any GPS into it, run OziExplorer and watch youself driving along at full screen size.
Hope this helps.


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