I've been using GPS receivers for about a decade, and I've owned Magellan, Garmin, and Delorme units in that time. For just basic back-country navigation without built-in mapping capabilities, they all make good units.
If you're wanting the latest bells and whistles, don't overlook the Delorme PN series. I think they are the best GPS receivers for back-country use, and I currently use my PN-40 exclusively for that purpose. The PC software is cumbersome, but works well once you figure it out. The feature that sold me on the unit was the ability to display color aerial photos and USGS topo maps, as well as the ability to purchase a one-year subscription to their map library, which allows you to download all the aerials and topos you wish to download.
If you want a GPS receiver for use on the street as well as in the back country, the Delorme falls a bit short and I think Garmin has an edge there. Also, the Delorme units are pretty much limited to use in North America because maps aren't available for other countries.
Regards,
Scott