I been wanting to get a hand held GPS also and settled on the ETREX 20x or ETREX 30X -- only feature advantage of the 30x over 20x that I can find is:
BUILT-IN SENSORS - eTrex 30x adds a built-in 3-axis tilt-compensated electronic compass and a barometric altimeter which tracks changes in pressure to pinpoint your precise altitude, and you even can use it to plot barometric pressure over time
WIRELESS - Wirelessly share your waypoints, tracks, routes and geocaches with other compatible devices -simply press "send" to transfer your information -also wirelessly connects to compatible Garmin devices, including VIRB and accessory sensors
I will use it mostly for lakes and hunting WMA/National forest/public lands etc. Think I will get the 30x mainly cause it also has the compass. Don't really care about the wireless sharing feature.