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Take a trip to your local GPS reseller and have a look at what is on offer.
In my location the local boating store has an excellent range of GPS's, so that may be a good starting point.
Look for facilities that will make your job easier(you can get GPS's with or without mapping, even contour databases and computer interface for download) and don't forget to check the battery life. Check to see if the maps are provided or have to be purchased as an extra.
If you can get a GPS that takes AA's as well as rechargeables this will help in the field, it's easy to carry a couple of extra replacement AA's along as recharging can be a pain if you're on foot.
It's also worthwile testing anything you're contemplating in daylight as some screens are hard to read in full sunlight.
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