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I don't have any advice since I don't have or use one, I get around with just a regular map book, although a sat-nav would come in handy in some cases.
I'd say you should go check out Price Costco if you have a membership. I remember they're selling a sat-nav unit for a couple of hundred bucks, but it should do whatever you wanted in terms of navigation. I don't know the brand, but to my recollection they only sell that one brand. If not, then check out Future Shop or Best Buy, they must have something there as well.
Regarding real tips, I can't think of any since I don't use one, but you should certainly get one that is at least powered by the adaptor where you can plug into the cigarette lighter. If you can get one with both cigarette lighter adaptor and battery power would be better, in case you wanna use it elsewhere other than inside a car. Other than that, I dunno what else to say, maybe someone else who've bought and used one might be better for giving real world advice.
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