I have taught many GPS classes and have had many occasion to use most all brands out there. here is my take on them
Garmin - easiest most user friendly to figure out and use
biggest complaint you can only use Mapsource background maps
newer ones use a chip with mapsource already on it, plug and play background maps
Magellan - not too bad not as easy as a Garmin but not bad
Lowrance - way to many bells and whistles, get too complicated
Eagle - not bad but not as easy as the others
Brunton - POS don't waste your money If anyone ever brings one to one of my classes again I will personally throw it in the corner and let them use my own GPS
Trimble - haven't dealt with any new ones in years havent even seen them anymore
If you are going to spend extra money on anything spend it on a color screen. They make it easier to read and quickly identify between water and vegetation and distinguish between other items much faster.
Don't spend the money on an electronic compass. They are battery eaters. They use battery power to establish a magnetic field to orient themselves. The magellans I just got done playing with for the Boyscouts would go haywire because of the electronic compass in my work Jeep.
Any GPS can be used as a compass, you just have move 15 or 20 feet to let it orient itself to the direction of travel.