I just got a Magellan Explorist 100. Works pretty good.the Explorist 200 and 300 have more features and mapping.
Garmin Etrex is all you need.
Get a Tom Tom....or was it a Kev Kev. Kev kev do I turn here? Kev Kev where's the nearest lodge? Kev Kev.....
P.S. this is a joke. I'm not sure what the best GPS unit is as I don't have one yet myself. But both Kev and Fred give good examples I'm sure. Oh, and I doubt the Tom Tom unit would be useful or practicle.