I did a search on "Best GPS receiver" and found the following with numerous member testimonials: Proven GPS receiver?
Here's another one from the same search terms: DeLorme Vs. Microsoft
Here's one on the Holux-210 that turned up under the same search terms: Proper Installation of GPS Receiver
In that same set of terms I turned up a comparison table that lists all of the major GPS receivers and documents their performance: GPS receiver tests by www.pocketgps.co.uk
Here's more member responses to the "best GPS question" from the same search terms: Looking for GPS