I'm rather partial to Garmin. My flying club has Garmin 430's in two of our planes, I have a Garmin 296 handheld for flying and driving, and a Garmin eTrex Vista for hiking and geocaching. I used to own a GPS Pilot III but that was replaced by the 296. They all have a consistent "feel" to the interface. Usually, I'm able to guess where something should be, so I don't have to memorize the menu system. This is especially important when setting up instrument approaches.