Another option is to go for a Magellan Sportrak series.
I do admit that the Garmin offerings are better.  However, given your budget, you might be able to snag a Magellan with mapping software for about that price.
Here are the relevant things to look for in a GPS (each one adds money -- you decide what is most important.):
1) Mapping.  Unless you get a good package deal, maps (either road or topo) will add around $100 or so.  Some cheaper units CANNOT use a map.
2) Storage for maps.  Some older units have a limited amount of memory built-in.  Newer ones use removable standard memory (SD or micro-SD).  Removable memory is better, since you can add a 1Gb card (enough to hold the entire US) for $20.
3) High-sensitivity chipset.  You can get by without it, but it sure helps when you are surrounded by trees or mountains.
4) Color screen.  Makes looking at the maps a LOT nicer.
5) High-resolution screen.  Less important than color, but still nice.
6) Turn-by-turn routing.  Your GPS can tell you when to turn while driving (with the right street mapping sofware).  Not really necessary for hunting/hiking, but it sure is nice to have when driving in a strange town.
7) Uses standard batteries (either AA or AAA).  Using standard batteries, you can carry spares.  With a built-in rechargable, carry a charger and a VERY long extention cord while hiking.
8) Waterproof/tough.  If you drop it on a rock or in a river, will it live?
Figure out which ones are the most important, and we can help narrow things down.
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Darwin was wrong -- I'm still alive