Garmin is the way to go. GPSMAP, Oregon, Montana are all good units. Look at the features though. My personal preference is a unit that accepts a microSD card, allows me to add maps, waterproof, etc. There are sites that have files that contain the GMU with private land owner contact information that can be loaded into the GPS unit. Helps keep you from straying onto private property.
wrt your health issue I would highly recommend a SPOT (
www.findmespot.com) unit. These allow you to get emergency services anywhere in the northern hemisphere. SPOT will also allow your wife to monitor your location, and for you to send text/e-mail messages back to her from the field just to let her know you are okay. A GPS will not help you here.