Back in 1997 I bought a Garmin 12XL from REI.  I still use it.
http://www.garmin.com/products/gps12xl/
Interface is relatively simple.

Earlier this year I bought a Garmin eTrex for my daughter.
http://www.garmin.com/products/etrex/

Whatever GPSr you decide on, you should make sure it's a
12-channel parallel receiver:
http://www.gpsinformation.org/dale/why12.htm
Nowadays, that shouldn't be a problem.
--
Ted Louis Glenn (tlglenn AT mindspring.com)
Tucson, Arizona, United States
Do not place my email address in a public place without my consent.