Go for a Garmin. Simply for the reason that the good fellas over at nzopen will help you with free maps and upgrades.
Everyone will harp on about the 62 and the 62s, they are good tough units but the user interface is no way as good as the touch screen models like the Oregons imho. They are just not as intuitive to use. The screen resolution isnt as good either. The downside is that these use slightly more battery power and you have to look after the touch screen.
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