Thank you Gitchee-Gummee for your response.
I have been doing quite a bit of research. I originally was going to go with a very basic gps.
Maybe this is a very nieve (sp) statement, but since I have no experience with any gps (other than on my phone), I feel I may be pretty adaptable to any brand at this point.
I have read very good reviews for the PN 40. I was looking at a Garmin Dakota 20. I found the reviews for the PN-40 was higher and more reviews for it than the Dakota. I am buying a used unit, and feel a bit comforted by the fact that he has found 500+ caches.
Any advice and feedback is much appreciated at this point.