I have used a Garmin NUVI 360 for over a year now and have found over 600 geocaches with it. Takes a little bit to load, using GSAK and macros and POIloader.
using this website helps
http://geocaching.totaltechworld.com/
I am looking for a GPS to give to my father who is 80 this year. Needs a big screen and easy controls. Any thoughts? He would like a car one so he can use it for traveling too.