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Claude - are you after a "GPS" receiver or "Sat Nav" perse? They're pretty different animals normally. A proper GPS system will give you the ability to load commonly-bought and calibrated WGS84 datum topographic maps and then be of use in the bush. Most of the garden variety Sat Nav units don't know where they're going once you leave tarmac - albeit accompanied by a nice voice telling you you're going the wrong way, and that you should do an immediate u-turn...
I have a few of both types (I do a lot of travelling in my 4WD), and use Garmin for GPS in the bush and TomTom on city streets. All modern units are pretty good, and all do much the same thing. Some make more sense in their recommended routes than others, and make sure you get one that can be easily updated with the latest maps as they change.
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