I disagree <img src="/images/graemlins/shocked.gif" alt="" /> You might want to start out with a simple 100$ unit before spending a bundle on the more sofisticated units. That way you will make an informed purchase.
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For remote wilderness adventures: I strongly reccomend you get trained in map & compass. Always have a paper map of the area you are tavelling. Learn to read the coordinates off your map & enter them in you GPS unit... It is the safest way to go. Sure you can rely on a GPS with integrated maps for 99% of your outings, but in the deep woods : map, compass GPS combo is the safest way to go !